Aldehydes can be distinguished from ketones by using
(a) Ammoniacal AgNO3 solution
(b) Phenylhydrazine
(c) Saturated NaHSO3 solution
(d) Thionyl chloride

1 Answer

Answer :

Ammoniacal AgNO3 solution

Related questions

Description : Benzaldehyde does not react with (a) Tollens' reagent (b) Phenylhydrazine (c) Fehling's solution (d) NaHSO3

Last Answer : Fehling's solution

Description : Which of the following compounds does not react with ammoniacal AgNO3 solution? (a) Acetylene (b) 1-Butyne (c) Propyne (d) 2-Butyne

Last Answer : 2-Butyne

Description : Which one of the following compounds will (a) decolorizes dilute cold KMnO4 ; (b) decolorizes bromine water ; and (c) gives a white precipitate with ammoniacal AgNO3 solution. (a) 1-Hexene (b) 1-Hexyne (c) 2-Hexene (d) 2-Hexyne

Last Answer : 1-Hexyne

Description : Ethylene and acetylene can be distinguished by using (a) Bromine in CCl4 (b) Tollens' reagent (b) Baeyer's reagent (d) Phenylhydrazine

Last Answer : Tollens' reagent

Description : Why are aldehydes more reactive than ketones ? 

Last Answer : Ans. It is because of 2 reasons : The carboxyl compounds (both aldehydes & ketones) undergo nucleophilic addition reaction. (i) + I effect : The alkyl group in ketones due to their e- ... its reactivity. (ii) Steric hindrance : Due to steric hindrance in ketones, they are less reactive.

Description : Which of the following statements is NOT correct : (a) Tollens' test is given by both aliphatic and aromatic aldehydes. (b) Fehling's test is given by aliphatic aldehydes. It is not given ... given by methyl ketones and acetaldehydes. (d) Lucas test is given by both aliphatic and aromatic aldehydes

Last Answer : Lucas test is given by both aliphatic and aromatic aldehydes

Description : Which of the following characterizes the reactions of aldehydes and ketones? (a) electrophilic addition (b) electrophilic substitution (c) nucleophilic acyl substitution (d) nucleophilic addition; free radical addition

Last Answer : nucleophilic addition; free radical addition

Description : Aldehydes undergo oxidation with KMnO4/H+ to give (a) Alcohols (b) Acetals (c) Ketones (d) Acids

Last Answer : Acids

Description : Which of the following reagents will react readily with both aldehydes and ketones? (a) Grignard reagent (b) Fehling's reagent (c) Tollens' reagent (d) Schiff's reagen

Last Answer : Grignard reagent

Description : Which statement about the carbonyl group of ketones and aldehydes is true? I. It can attract nucleophiles. II. It can attract electrophiles. III. It tends to undergo addition reactions. IV. It tends to undergo substitution reactions. (a) I and III (b) II and IV (c) I, II, and III (d) I, III, and IV

Last Answer : I, II, and III

Description : Which action best accounts for the solubility of aldehydes and ketones in water? (a) Polar interactions between solute molecules. (b) H-bonding between solute molecules. (c) Van der waals forces (d) H-bonding between solute and solvent molecules

Last Answer : H-bonding between solute and solvent molecules

Description : The melting points of aldehydes and ketones tend to : (a) decrease with increasing molecular weight. (b) increase with increasing molecular weight. (c) remain unchanged with increasing molecular weight. (d) be unpredictable due to resonance

Last Answer : increase with increasing molecular weight.

Description : What property of low-molecular weight aldehydes and ketones accounts for the magnitude of their boiling points? (a) The ability to form strong H-bonds between their molecules. (b) The ability of ... other polar molecules. (d) The ability of the carbonyl group to attract electrophiles and form bonds.

Last Answer : The ability of the polar carbonyl group to attract other polar molecules.

Description : What do you observe when ethyne is passed through ammoniacal cuprous chloride solution?

Last Answer : A red-brown precipitate of copper acetylide is formed.

Description : Nitrogen present in the flue gas is determined in the Orsat apparatus by absorbing it in (A) KOH (B) Ammoniacal cuprous chloride (C) Pyrogallol solution (D) None of these

Last Answer : (D) None of these

Description : 4-amino-3-methylbutanoic acid is treated with thionyl chloride followed by ammonia to obtain compound X. X on reaction with, bromine in an alkaline me

Last Answer : 4-amino-3-methylbutanoic acid is treated with thionyl chloride followed by ammonia to obtain compound X. X on ... B. 80 mL C. 120 mL D. 200 mL

Description : The product formed in the reaction of `SOCl_2` (thionyl chloride) with white phosphorous is.

Last Answer : The product formed in the reaction of `SOCl_2` (thionyl chloride) with white phosphorous is. A. `PCl_(3)` B. `SO_(2)Cl_(2)` C. `SCl_(2)` D. `POCl_(3)`

Description : The product formed in the reaction of `SOCl_2` (thionyl chloride) with white phosphorous is.

Last Answer : The product formed in the reaction of `SOCl_2` (thionyl chloride) with white phosphorous is. A. `PCl_(3)` B. `SO_(2)Cl_(2)` C. `SCl_(2)` D. `POCl_(3)`

Description : Which of the following compounds reacts with ammoniacal cuprous chloride to give a precipitate? (a) 1-Butene (b) 1-Butyne (c) 2-Butene (d) 2-Butyne

Last Answer : 1-Butyne

Description : Which of the following reagents can be used to distinguish between chlorobenzene and benzyl chloride? (a) alcoholic AgNO3 (b) Br2 in CCl4 (c) KCN (d) Br2 in H2O

Last Answer : alcoholic AgNO3

Description : Which of the following compounds will give a white precipitate with alcoholic AgNO3? (a) Vinylbenzene (b) Chlorobenzene (c) Vinyl chloride (d) Allyl chloride

Last Answer : Allyl chloride

Description : In Orsat's apparatus, ammoniacal cuprous chloride is used for selectivity absorbing (A) CO (B) CO2 (C) O2 (D) H2O

Last Answer : (A) CO

Description : Orsat apparatus is meant for (A) Gravimetric analysis of flue gas (B) Finding out combustion efficiency (C) Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride (D) None of these

Last Answer : (D) None of these

Description : A compound, C4H6, reacts with bromine and forms a white precipitate with ammoniacal silver nitrate solution. It reacts with dilute H2SO4 in the presence of mercuric sulfate to form 2-butanone. The compound could be (a) 1-Butyne (b) 1-Butene (c) 2-Butyne (d) 2-Butene

Last Answer : 1-Butyne

Description : A cationic complex has two isomers A & B. Each has one Co3+, five NH3 , one Br and one SO4 2 . A gives a white precipitate with BaCl2 solution while B gives a yellow precipitate with AgNO3 ... are the possible structures of the complexes A and B ? (a) Will the two complexes have same colour ?

Last Answer : (a) [CO (NH3 ) 5 Br] SO4 and [CO (NH3 ) 5 SO4 ] Br  (b) NO

Description : A sol is prepared by addition to excess AgNO3 solution in KI solution. What charge is likely to develop on the colloidal particles ?

Last Answer : Ans. Positive. 

Description : Ethyl acetoacetate reacts with phenylhydrazine to give (a) Antipyrine (b) Aspirin (c) 4-Methyl uracil (d) DDT

Last Answer : Antipyrine

Description : Which of the following will not give white precipitate with ammoniacal silver nitrate solution ?

Last Answer : Which of the following will not give white precipitate with ammoniacal silver nitrate solution ? A. `CH_(3)-C-=C-CH_(3)` B. C. D.

Description : Ammonia present in the coke oven gas is removed by washing with (A) Caustic solution (B) Dilute ammoniacal liquor (C) Dilute HCl (D) Ethanolamine

Last Answer : (B) Dilute ammoniacal liquor

Description : Flushing liquor used for cooling coke oven gas constitutes of (A) Ammoniacal liquor (B) K2CO3 solution (C) Dilute H2SO4 (D) Dilute HCl

Last Answer : (A) Ammoniacal liquor

Description : The pair(s) which will show displacement reaction is/are (i) NaCl solution and copper metal (ii) AgNO3 solution and copper metal (iii) Al2(SO4)3 solution and magnesium metal (iv) ZnSO4 solution and iron metal (a) (ii) only (b) (ii) and (iii) (c) (iii) and (iv) (d) (i) and (ii)

Last Answer : (c) (iii) and (iv)

Description : How can a colloidal solution and true solution of the same colour be distinguished from each other?

Last Answer : Ans.: By Tyndal effect( colloidal solution will scatter light and path becomes lighted where as no such phenomena is observed in true solution.)

Description : CH3CHO and C6H5CH2CHO can be distinguished chemically by (1) Fehling solution test (2) Benedict test (3) Iodoform test (4) Tollen’s reagent test

Last Answer : Iodoform test

Description : Which of the following compounds will react with ammoniacal silver nitrate? (a) 1-Butene (b) 1-Butyne (c) 2-Butene (d) 2-Butyne

Last Answer : 1-Butyne

Description : When a coordination compound CoCl3.6NH3 is mixed with AgNO3, 3 moles of AgCl are precipitated per mole of the compound. Write (i) Structural formula of the complex (ii) IUPAC name of the complex -Chemistry

Last Answer : i) Complex so formed is: CoCl3.6NH3 + AgNO3 → [Co(NH3)6]Cl3 (ii) IUPAC name of complex is: Hexaamminecobalt (III) chloride

Description : When a co-ordination compound CrCl3.6H2O is mixed with AgNO3, 2 moles of AgCl are precipitated per mole of the compound. Write (i) Structural formula of the complex. (ii) IUPAC name of the complex. -Chemistry

Last Answer : (i) The complex formed on mixing a coordination compound CrCl3.6H2O with AgNO3 is as follows CrCl3.6H2O + AgNO3 → [Cr(H2O5)Cl]Cl2. H2O (ii) Pentaaquachloridochromium (III) chloride monohydrate

Description : Will CCl4 give white ppt.of AgCl on heating with AgNO3?

Last Answer : No, CCl4 being covalent compound does not give white ppt.of AgCl on heating with AgNO3

Description : NaCl gives a white ppt. with AgNO3 but CCl4 does not. Why?

Last Answer : Answer. Being an ionic compound NaCl gives Cl negative ion and thus gives White ppt. with silver nitrate but CCl4 is a covalent compound and thus do not give Cl negative ions.

Description : Acetaldehyde on treatment with Tollens' reagent gives a precipitate of (a) Ag (b) AgNO3 (c) Cu2O (d) None of these

Last Answer : Ag

Description : Which of the following compounds will not give a white precipitate with alcoholic AgNO3. (a) Bromobenzene (b) 1-Bromopropane (c) Ethyl bromide (d) 2-Bromopropane

Last Answer : Bromobenzene

Description : Ketones are prepared by the oxidation of (a) Primary alcohol (b) Secondary alcohol (c) Tertiary alcohol (d) None of these

Last Answer : Secondary alcohol

Description : Ketones react with Grignard reagents to form an addition product which on hydrolysis gives a (a) Primary alcohol (b) Tertiary alcohol (c) Secondary alcohol (d) Ketal

Last Answer : Tertiary alcohol

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

Description : Ketones are organic compounds. Name the functional group that all ketone molecules contain.

Last Answer : ANSWER: CARBONYL GROUP pr C DOUBLE BOND O

Description : Chemically fats and oils are: (1) Triesters (2) Amines (3) Aldehydes (4) Ketons

Last Answer : (1) Triesters Explanation: Fats and oils are called triglycerides (or triacylcylgerols) because they are esters composed of three fatty acid units joined to glycerol, a trihydroxy alcohol. Fats and oils are composed of molecules known as triglycerides, which are esters.

Description : What type of aldehydes undergo Cannizaro reaction ?

Last Answer : Ans. Aromatic and aliphatic aldehydes which do not contain hydrogens. 

Description : Acid chlorides undergo reduction to the corresponding aldehydes on treatment with hydrogen in the presence of Pd/BaSO4. This reaction is called : (a) Clemmensen reduction (b) Rosenmund reduction (c) Wolf-Kishner reduction (d) None of these

Last Answer : Rosenmund reduction

Description : Why do aldehydes undergo nucleophilic addition reactions while esters undergo nucleophilic acyl substitution reactions? (a) The carbonyl carbon of an ester is more electrophilic than that of an aldehyde. (b) ... adds to an aldehyde, neither H− nor R− can be eliminated since they are strongly basic

Last Answer : Once the nucleophile adds to an aldehyde, neither H− nor R− can be eliminated since they are strongly basic

Description : Primary alcohols have boiling points that are _____________ the corresponding aldehydes. (a) Lower than (b) Higher than (c) About the same

Last Answer : Higher than

Description : Which of the following reagents can be used to oxidize 1° alcohols to aldehydes? (a) KMnO4 (b) MnO2 (c) K2Cr2O7 (d) PCC

Last Answer : PCC