Total aldol condensation products (including stereosimers) formed by the reaction between acetaldehyde and acetophenone is :

Total aldol condensation products (including stereosimers) formed by the reaction between acetaldehyde and acetophenone is :
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Total aldol condensation products (including stereosimers) formed by the reaction between acetaldehyde and acetophenone is :
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Total aldol condensation products (including stereosimers) formed by the reaction between acetaldehyde and acetophenone is :

Description : Total aldol condensation products (including stereosimers) formed by the reaction between acetaldehyde and acetophenone is :

Last Answer : Total aldol condensation products (including stereosimers) formed by the reaction between acetaldehyde and acetophenone is :

In the scheme given below, the total number of intramolecular aldol condensation products formed from (Y) is

Description : In the scheme given below, the total number of intramolecular aldol condensation products formed from (Y) is

Last Answer : In the scheme given below, the total number of intramolecular aldol condensation products formed from (Y) is

Indicate the starting aldehyde or ketone from which each of the following compounds are formed by an aldol condensation reaction. (a)2-Ethyl-3-hydroxy

Description : Indicate the starting aldehyde or ketone from which each of the following compounds are formed by an aldol condensation reaction. (a)2-Ethyl-3-hydroxy

Last Answer : Indicate the starting aldehyde or ketone from which each of the following compounds are formed by an ... hexanal (b) 4-Hydroxy-4-methyl-2-pentanone

Indicate the starting aldehyde or ketone from which each of the following compounds are formed by an aldol condensation reaction. (a)2-Ethyl-3-hydroxy

Description : Indicate the starting aldehyde or ketone from which each of the following compounds are formed by an aldol condensation reaction. (a)2-Ethyl-3-hydroxy

Last Answer : Indicate the starting aldehyde or ketone from which each of the following compounds are formed by an ... hexanal (b) 4-Hydroxy-4-methyl-2-pentanone

Base-catalyzed condensation of two ester molecules to form an alcohol and β-keto ester is called (a) Claisen condensation (b) Corey-House reaction (c) Aldol condensation (d) Transesterification

Description : Base-catalyzed condensation of two ester molecules to form an alcohol and β-keto ester is called (a) Claisen condensation (b) Corey-House reaction (c) Aldol condensation (d) Transesterification

Last Answer : Claisen condensation

When formaldehyde is treated with 50% NaOH solution, it undergoes (a) Cannizzaro reaction (b) Wurtz reaction (c) Aldol condensation (d) Hydrolysis

Description : When formaldehyde is treated with 50% NaOH solution, it undergoes (a) Cannizzaro reaction (b) Wurtz reaction (c) Aldol condensation (d) Hydrolysis

Last Answer : Cannizzaro reaction

Acetone undergoes reduction with zinc amalgam in HCl to form propane. This reaction is known as (a) Clemmensen reduction (b) Wolf-Kishner reduction (c) Rosenmund reduction(d) Aldol condensation

Description : Acetone undergoes reduction with zinc amalgam in HCl to form propane. This reaction is known as (a) Clemmensen reduction (b) Wolf-Kishner reduction (c) Rosenmund reduction (d) Aldol condensation

Last Answer : Clemmensen reduction

The reaction of a sodium alkoxide with an alkyl halide is called (a) Wurtz-Fittig reaction (b) Perkin reaction (c) Williamson's synthesis (d) Aldol condensation

Description : The reaction of a sodium alkoxide with an alkyl halide is called (a) Wurtz-Fittig reaction (b) Perkin reaction (c) Williamson's synthesis (d) Aldol condensation

Last Answer : Williamson's synthesis

The conversion of secondary alcohol to ketones in presence of aluminium isopropoxide and acetone as solvent is? a. Canizarro reaction b. Oppenauer oxidation c. Suzuki reaction d. Aldol Condensation

Description : The conversion of secondary alcohol to ketones in presence of aluminium isopropoxide and acetone as solvent is? a. Canizarro reaction b. Oppenauer oxidation c. Suzuki reaction d. Aldol Condensation

Last Answer : b. Oppenauer oxidation

Number of possible intra molecular aldol condensation product on heating with NaOH `H_(3)C-overset(O)overset(||)(C)-CH_(2)-CH_(2)-CH_(2)-overset(O)ove

Description : Number of possible intra molecular aldol condensation product on heating with NaOH `H_(3)C-overset(O)overset(||)(C)-CH_(2)-CH_(2)-CH_(2)-overset(O)ove

Last Answer : Number of possible intra molecular aldol condensation product on heating with NaOH `H_(3)C-overset(O)overset(|| ... CH_(2)-overset(O)overset(||)(C)-H`

(X) is the product of cross aldol condensation between benzaldehyde `(C_(6)H_(5)CHO)` and acetone. What is its structure ?

Description : (X) is the product of cross aldol condensation between benzaldehyde `(C_(6)H_(5)CHO)` and acetone. What is its structure ?

Last Answer : (X) is the product of cross aldol condensation between benzaldehyde `(C_(6)H_(5)CHO)` and acetone. What is its ... )-C=(CH_(3))_(2)` D. None of these

Number of possible intra molecular aldol condensation product on heating with NaOH `H_(3)C-overset(O)overset(||)(C)-CH_(2)-CH_(2)-CH_(2)-overset(O)ove

Description : Number of possible intra molecular aldol condensation product on heating with NaOH `H_(3)C-overset(O)overset(||)(C)-CH_(2)-CH_(2)-CH_(2)-overset(O)ove

Last Answer : Number of possible intra molecular aldol condensation product on heating with NaOH `H_(3)C-overset(O)overset(|| ... CH_(2)-overset(O)overset(||)(C)-H`

(X) is the product of cross aldol condensation between benzaldehyde `(C_(6)H_(5)CHO)` and acetone. What is its structure ?

Description : (X) is the product of cross aldol condensation between benzaldehyde `(C_(6)H_(5)CHO)` and acetone. What is its structure ?

Last Answer : (X) is the product of cross aldol condensation between benzaldehyde `(C_(6)H_(5)CHO)` and acetone. What is its ... )-C=(CH_(3))_(2)` D. None of these

Why does methanal not give aldol condensation while ethanol gives ?

Description : Why does methanal not give aldol condensation while ethanol gives ? 

Last Answer : Ans. This is because only those compounds which have hydrogen atoms can undergo  aldol reaction. Ethanol possesses -hydrogen and undergoes aldol condensation.   Methanal has no hydrogen atoms, hence does not undergo aldol condensation. 

Which of the following will undergo Aldol condensation? (a) Acetone (b) Benzaldehyde (c) Benzoic acid (c) Benzophenone

Description : Which of the following will undergo Aldol condensation? (a) Acetone (b) Benzaldehyde (c) Benzoic acid (c) Benzophenone

Last Answer : Acetone

Which of the following statements describes the first step in the mechanism of the aldol condensation? (a) An alpha hydrogen is abstracted by the base to form an enolate anion. (b) A nucleophilic base attacks the carbonyl carbon atom. (c) The carbonyl oxygen is protonated by the base ion. (d) The alpha hydrogen is abstracted by an acid to the enolate anion.

Description : Which of the following statements describes the first step in the mechanism of the aldol condensation? (a) An alpha hydrogen is abstracted by the base to form an enolate anion. (b) A nucleophilic base attacks ... by the base ion. (d) The alpha hydrogen is abstracted by an acid to the enolate anion.

Last Answer : An alpha hydrogen is abstracted by the base to form an enolate anion

In the following reaction sequence, the amount of D (in g) formed from to moles of acetophenone is.......... (Atomic weights in `g mol^(-1) : H = 1, C

Description : In the following reaction sequence, the amount of D (in g) formed from to moles of acetophenone is.......... (Atomic weights in `g mol^(-1) : H = 1, C

Last Answer : In the following reaction sequence, the amount of D (in g) formed from to moles of acetophenone ... product in each step is given in the parenthesis)

Condensation polymerisation of __________ produces Bakelite. (A) Propylene (B) Phenol & formaldehyde (C) Phenol & acetaldehyde (D) Urea & formaldehyde

Description : Condensation polymerisation of __________ produces Bakelite. (A) Propylene (B) Phenol & formaldehyde (C) Phenol & acetaldehyde (D) Urea & formaldehyde

Last Answer : (B) Phenol & formaldehyde

Give the mechanisms of aldol reaction (s) that occurs in the following transformation

Description : Give the mechanisms of aldol reaction (s) that occurs in the following transformation

Last Answer : Give the mechanisms of aldol reaction (s) that occurs in the following transformation A. 1 B. 2 C. 3 D. 4

Carbonyl compound which contains `alpha-H` gives aldol condenation reaction in presence of alkaline medium. The reaction between two molecules of acet

Description : Carbonyl compound which contains `alpha-H` gives aldol condenation reaction in presence of alkaline medium. The reaction between two molecules of acet

Last Answer : Carbonyl compound which contains `alpha-H` gives aldol condenation reaction in presence of alkaline medium. The ... and 2,8-diketone D. All of these

Carbonyl compound which contains `alpha-H` gives aldol condenation reaction in presence of alkaline medium. The reaction between two molecules of acet

Description : Carbonyl compound which contains `alpha-H` gives aldol condenation reaction in presence of alkaline medium. The reaction between two molecules of acet

Last Answer : Carbonyl compound which contains `alpha-H` gives aldol condenation reaction in presence of alkaline medium. The reaction ... )H-(CH_(2))_(4)-CH_(3)`

Carbonyl compound which contains `alpha-H` gives aldol condenation reaction in presence of alkaline medium. The reaction between two molecules of acet

Description : Carbonyl compound which contains `alpha-H` gives aldol condenation reaction in presence of alkaline medium. The reaction between two molecules of acet

Last Answer : Carbonyl compound which contains `alpha-H` gives aldol condenation reaction in presence of alkaline medium. The ... and 2,8-diketone D. All of these

Carbonyl compound which contains `alpha-H` gives aldol condenation reaction in presence of alkaline medium. The reaction between two molecules of acet

Description : Carbonyl compound which contains `alpha-H` gives aldol condenation reaction in presence of alkaline medium. The reaction between two molecules of acet

Last Answer : Carbonyl compound which contains `alpha-H` gives aldol condenation reaction in presence of alkaline medium. The reaction ... )H-(CH_(2))_(4)-CH_(3)`

acetaldehyde reacts with a mixture of KCN and `NH_(4)Cl` to give a product X which upon hydrolysis yields alanine. The products X is

Description : acetaldehyde reacts with a mixture of KCN and `NH_(4)Cl` to give a product X which upon hydrolysis yields alanine. The products X is

Last Answer : acetaldehyde reacts with a mixture of KCN and `NH_(4)Cl` to give a product X which upon ... . a cyanohydrin C. an aminoalcohol D. a chlorohydrin

Pick out the wrong statement. (A) 'Solvates' are chemical compounds formed by solute with their solvents. When water is the solvent, then it is called a 'hydrate' (B) In heat exchanger calculations (Δt) weighted is used in place of Δt, when it involves more than one sequence of heating or cooling i.e., desuperheating & condensation or condensation & sub-cooling (C) Heat transfer co-efficient during nucleate boiling is not influenced by the agitation imparted (D) In case of short tube vertical evaporators, area of central downtake is about 50 to 100% of the total tube cross-sectional area

Description : Pick out the wrong statement. (A) 'Solvates' are chemical compounds formed by solute with their solvents. When water is the solvent, then it is called a 'hydrate' (B) In heat exchanger ... vertical evaporators, area of central downtake is about 50 to 100% of the total tube cross-sectional area

Last Answer : (C) Heat transfer co-efficient during nucleate boiling is not influenced by the agitation imparted

Acetaldehyde on reaction with sodium hydrogen sulphite produces

Description : Acetaldehyde on reaction with sodium hydrogen sulphite produces

Last Answer : Acetaldehyde on reaction with sodium hydrogen sulphite produces A. B. C. D.

Acetaldehyde on reaction with sodium hydrogen sulphite produces

Description : Acetaldehyde on reaction with sodium hydrogen sulphite produces

Last Answer : Acetaldehyde on reaction with sodium hydrogen sulphite produces A. B. C. D.

Cannizzaro reaction is not given by (a) Formaldehyde (b) Trimethylacetaldehyde (c) Acetaldehyde (d) Benzaldehyde

Description : Cannizzaro reaction is not given by (a) Formaldehyde (b) Trimethylacetaldehyde (c) Acetaldehyde (d) Benzaldehyde

Last Answer : Acetaldehyde

Arrange the following carboxyl compounds in increasing order of their reactivity in nucleophilic addition reactions. Explain with proper reasoning : Benzaldehyde. p-tolualdeyde, p-nitrobenzaldehyde, Acetophenone.

Description : Arrange the following carboxyl compounds in increasing order of their reactivity in nucleophilic addition reactions. Explain with proper reasoning : Benzaldehyde. p-tolualdeyde, p-nitrobenzaldehyde, Acetophenone.

Last Answer : Ans. Acetophenone is a ketone while all others are aldehydes, therefore it is least reactive. In p-tolualdehyde, there is methyl group (CH3 ) at para position w.r.t. to the ... overall order of increasing reactivity : acetophenone < p-tolualdehyde < benzaldehyde < p-nitrobenzaldehyde. 

Phenylmagnesium bromide reacts with CO2 followed by acid-hydrolysis to form : (a) Phenol (b) Benzoic acid (c) Bromobenzene (d) Acetophenone

Description : Phenylmagnesium bromide reacts with CO2 followed by acid-hydrolysis to form : (a) Phenol (b) Benzoic acid (c) Bromobenzene (d) Acetophenone

Last Answer : Benzoic acid

Which of the following compounds yields a yellow precipitate when warmed with a mixture of iodine in aqueous sodium hydroxide? (a) Acetophenone (b) Benzaldehyde(c) Benzophenone(d) Propanal

Description : Which of the following compounds yields a yellow precipitate when warmed with a mixture of iodine in aqueous sodium hydroxide? (a) Acetophenone (b) Benzaldehyde (c) Benzophenone (d) Propanal

Last Answer : Acetophenone

Benzaldehyde can be distinguished from acetophenone by using : (a) Tollens' reagent (b) Lucas reagent (c) Fehling's reagent (d) All of these

Description : Benzaldehyde can be distinguished from acetophenone by using : (a) Tollens' reagent (b) Lucas reagent (c) Fehling's reagent (d) All of these

Last Answer : Tollens' reagent

Acetophenone reacts with Br2 in the presence of FeCl3 to form : (a) m-Bromoacetophenone (b) m-Dibromobenzene(c) o- + p-Bromoacetophenone(d) p-Dibromobenzene

Description : Acetophenone reacts with Br2 in the presence of FeCl3 to form : (a) m-Bromoacetophenone (b) m-Dibromobenzene (c) o- + p-Bromoacetophenone (d) p-Dibromobenzene

Last Answer : m-Bromoacetophenone

Benzaldehyde reacts with methylmagnesium iodide (followed by hydrolysis) to form (a) 1-Phenylethanol (b) Acetophenone (c) 2-Phenylethanol (c) Benzophenone

Description : Benzaldehyde reacts with methylmagnesium iodide (followed by hydrolysis) to form (a) 1-Phenylethanol (b) Acetophenone (c) 2-Phenylethanol (c) Benzophenone

Last Answer : 1-Phenylethanol

Benzene reacts with acetic anhydride in the presence of AlCl3 to form (a) Acetophenone (b) Benzophenone (c) Phenylacetic acid (d) Phenyl acetate

Description : Benzene reacts with acetic anhydride in the presence of AlCl3 to form (a) Acetophenone (b) Benzophenone (c) Phenylacetic acid (d) Phenyl acetate

Last Answer : Acetophenone

Which of the following agents is used in order to make benzene react with acetyl chloride to give acetophenone?(a) Ultraviolet light (b) AlCl3 catalyst (c) Platinum catalyst (d) Al2O3 catalyst

Description : Which of the following agents is used in order to make benzene react with acetyl chloride to give acetophenone? (a) Ultraviolet light (b) AlCl3 catalyst (c) Platinum catalyst (d) Al2O3 catalyst

Last Answer : AlCl3 catalyst

An unknown compound gave a positive Tollens' test. Treatment of the unknown with I2/NaOH gave a solid which was identified as iodoform. The unknown was? (a) Ethanal (b) Acetone (c) Propanal (d) Acetophenone

Description : An unknown compound gave a positive Tollens' test. Treatment of the unknown with I2/NaOH gave a solid which was identified as iodoform. The unknown was? (a) Ethanal (b) Acetone (c) Propanal (d) Acetophenone

Last Answer : Ethanal

One of the ways of calculating the top product’s demand is by a. multiplying the total market share for that product in that segment by the total market demand for that segment. b. multiplying the top demand percentage by the total market demand for that segment. c. divide the top product segment’s score by the sum of all other scores in that segment (not counting fringe products). d. divide the total demand for that market segment by the total number of products in that segment (not including fringe).

Description : One of the ways of calculating the top product's demand is by a. multiplying the total market share for that product in that segment by the total market demand for that segment. b. ... demand for that market segment by the total number of products in that segment (not including fringe).

Last Answer : c. divide the top product segment’s score by the sum of all other scores in that segment (not counting fringe products).

Which of the following statements concerning perioperative nutrition is true concerning the above-described patient? a. Since the patient’s weight had been stable with no preoperative nutritional deficit, 5% dextrose intravenous solutions are adequate for the initial postoperative source of nutrition b. Preoperative immunologic status should be determined including total peripheral lymphocyte count and delayed hypersensitivity reaction to determine skin-test response to common antigens c. Routine postoperative fluid administration with intravenous 5% glucose solutions can provide the calories to meet basal energy requirements d. A jejunal feeding catheter should be placed at the time of surgery for postoperative enteral feeding

Description : Which of the following statements concerning perioperative nutrition is true concerning the above-described patient? a. Since the patient's weight had been stable with no preoperative nutritional deficit ... feeding catheter should be placed at the time of surgery for postoperative enteral feeding

Last Answer : Answer: a Most patients undergoing elective operations are adequately nourished. Unless the patient has suffered significant preoperative malnutrition, characterized by weight loss greater than ... gastrointestinal surgery, this technique would not appear indicated in the patient described above

Which of the following is formed by condensation polymerisation.

Description : Which of the following is formed by condensation polymerisation.

Last Answer : Which of the following is formed by condensation polymerisation. A. Nylon-66 B. Terylene C. Bakelite D. All of these

The flat like structures formed due to condensation of gaseous clouds after big-bong where called as :

Description : The flat like structures formed due to condensation of gaseous clouds after big-bong where called as :

Last Answer : The flat like structures formed due to condensation of gaseous clouds after big-bong where called as : A. Planets B. Sun C. Nebula D. Galaxy

Pick out the wrong statement. (A) Addition polymers are generally formed by chain growth polymerisation (B) Condensation polymers are generally formed by step growth polymerisation (C) Teflon is formed by step growth polymerisation (D) Bakelite is formed by step growth polymerisation

Description : Pick out the wrong statement. (A) Addition polymers are generally formed by chain growth polymerisation (B) Condensation polymers are generally formed by step growth polymerisation (C) Teflon is formed by step growth polymerisation (D) Bakelite is formed by step growth polymerisation

Last Answer : C) Teflon is formed by step growth polymerisation

Vitamin required for metabolism of diols e.g. conversion of ethylene glycol to acetaldehyde is (A) Thiamin (B) Cobalamin (C) Pyridoxine (D) Folic acid

Description : Vitamin required for metabolism of diols e.g. conversion of ethylene glycol to acetaldehyde is (A) Thiamin (B) Cobalamin (C) Pyridoxine (D) Folic acid

Last Answer : Answer : B

Alcohol dehydrogenase converts ethanol into (A) Acetyl CoA (B) Acetaldehyde (C) Acetate (D) CO2 and H2O

Description : Alcohol dehydrogenase converts ethanol into (A) Acetyl CoA (B) Acetaldehyde (C) Acetate (D) CO2 and H2O

Last Answer : Answer : B

Bakelite is a copolymer of Phenol and - (1) Formaldehyde (2) Acetaldehyde (3) Benzaldehyde (4) Cinnaldehyde

Description : Bakelite is a copolymer of Phenol and - (1) Formaldehyde (2) Acetaldehyde (3) Benzaldehyde (4) Cinnaldehyde

Last Answer : (1) Formaldehyde Explanation: Bakelite is an early plastic. It is a thermosetting phenol formaldehyde resin, formed from an elimination reaction of phenol with formaldehyde.

Styrene which is a monomer for the production of polystyrene, is commercially produced by the (A) Catalytic dehydrogenation of ethyl benzene (B) Dehydration of ethyl alcohol followed by hydrogenation (C) Reacting ethylene oxide with acetaldehyde (D) Fermentation of starch

Description : Styrene which is a monomer for the production of polystyrene, is commercially produced by the (A) Catalytic dehydrogenation of ethyl benzene (B) Dehydration of ethyl alcohol followed by hydrogenation (C) Reacting ethylene oxide with acetaldehyde (D) Fermentation of starch

Last Answer : (A) Catalytic dehydrogenation of ethyl benzene

Acetaldehyde is produced by hydration of acetylene in a sulphuric acid solution of mercuric sulphate. Hydration tower is made of (A) Rubber lined mild steel (B) Lead lined mild steel (C) Aluminium (D) Cast iron

Description : Acetaldehyde is produced by hydration of acetylene in a sulphuric acid solution of mercuric sulphate. Hydration tower is made of (A) Rubber lined mild steel (B) Lead lined mild steel (C) Aluminium (D) Cast iron

Last Answer : (A) Rubber lined mild steel

Acetaldehyde is shipped in __________ drums. (A) Cast iron (B) Steel (C) Aluminium (D) Either (B) & (C)

Description : Acetaldehyde is shipped in __________ drums. (A) Cast iron (B) Steel (C) Aluminium (D) Either (B) & (C)

Last Answer : (D) Either (B) & (C)

Distinguish between : (i) Acetaldehyde and acetone (ii) Methanoic acid and Ethanoic acid.

Description : Distinguish between : (i) Acetaldehyde and acetone (ii) Methanoic acid and Ethanoic acid.

Last Answer : (i) Acetaldehyde will give positive tests with Tollen’s reagent and Fehling Solns. whereas acetone will not give these test. (ii) Methanoic acid gives Tollen’s reagent test whereas ethanoic acid does not due to difference in their boiling points.

The end product of fermentation are (a) O2 and C2H5OH (b) CO2 and acetaldehyde (c) CO2 and O2 (d) CO2 and C2H5OH.

Description : The end product of fermentation are (a) O2 and C2H5OH (b) CO2 and acetaldehyde (c) CO2 and O2 (d) CO2 and C2H5OH.

Last Answer : d) CO2 and C2H5OH.