Statement-1: In protic solvents phenoxide ion is alkylated primarily at C-alkylation whereas in polar aprotic solvents O-alkylation with alkyl halide.

Statement-1: In protic solvents phenoxide ion is alkylated primarily at C-alkylation whereas in polar aprotic solvents O-alkylation with alkyl halide.
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Statement-1: In protic solvents phenoxide ion is alkylated primarily at C-alkylation whereas in polar ... Statement-1 is false, Statement-2 is true
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Which of the following are aprotic solvents?

Description : Which of the following are aprotic solvents?

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In an alkyl halide substitution of hydrogen by deuterium results in slow formation of ion pair. This is known as? a. Ortho effect b. Mesomeric effect c. Secondary kinetic isotope effect d. Primary kinetic isotope effect

Description : In an alkyl halide substitution of hydrogen by deuterium results in slow formation of ion pair. This is known as? a. Ortho effect b. Mesomeric effect c. Secondary kinetic isotope effect d. Primary kinetic isotope effect

Last Answer : c. Secondary kinetic isotope effect

Which alkyl halide would be preferred for the synthesis of the following ether by Williamson synthesis ? `H_(5)C_(2)-O-overset(CH_(3))overset(|)unders

Description : Which alkyl halide would be preferred for the synthesis of the following ether by Williamson synthesis ? `H_(5)C_(2)-O-overset(CH_(3))overset(|)unders

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Which of the following alkane is synthesised from single alkyl halide by wurtz reaction:-

Description : Which of the following alkane is synthesised from single alkyl halide by wurtz reaction:-

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In order to prepare a `1^(@)` amine from an alkyl halide with simultaneous addition of one `CH_(2)` group in the carbon chain, the reagent used as sou

Description : In order to prepare a `1^(@)` amine from an alkyl halide with simultaneous addition of one `CH_(2)` group in the carbon chain, the reagent used as sou

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`S_(N^(1))` mechanism for the hydrolysis of an alkyl halide involves the formation of intermediate:

Description : `S_(N^(1))` mechanism for the hydrolysis of an alkyl halide involves the formation of intermediate:

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When ammonia is added to an alkyl halide, in the presence of base : (a) primary amines form (b) amides form (c) nitrated alkyl halides form (d) quaternary ammonium salts form

Description : When ammonia is added to an alkyl halide, in the presence of base : (a) primary amines form (b) amides form (c) nitrated alkyl halides form (d) quaternary ammonium salts form

Last Answer : primary amines form

Which reaction does not yield an ester as one of the products?(a) A carboxylic acid is heated with an alcohol (b) A Grignard reagent is added to a carboxylic acid (c) An acid halide is treated with an alcohol (d) An alkyl halide is heated with the salt of a carboxylic acid

Description : Which reaction does not yield an ester as one of the products? (a) A carboxylic acid is heated with an alcohol (b) A Grignard reagent is added to a carboxylic acid (c) An acid halide is treated with an alcohol (d) An alkyl halide is heated with the salt of a carboxylic acid

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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

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Which is the most reactive alkyl halide in a SN1 reaction? (a) CH3F (b) CH3Br (c) CH3I (d) CH3Cl

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Last Answer : CH3I

Which of the following factors has no effect on the rate of SN1 reactions? (a) the nature of the alkyl halide (b) the nature of the leaving group (c) the concentration of the alkyl halide (d) the concentration of the nucleophile

Description : Which of the following factors has no effect on the rate of SN1 reactions? (a) the nature of the alkyl halide (b) the nature of the leaving group (c) the concentration of the alkyl halide (d) the concentration of the nucleophile

Last Answer : the concentration of the nucleophile

Which of the following is the rate law for SN1 mechanisms? (a) Rate = k[Alkyl Halide] [Nucleophile] (b) Rate = k[Nucleophile] (c) Rate = k[Alkyl Halide](d) Rate = k1[Alkyl Halide] + k2[Nucleophile]

Description : Which of the following is the rate law for SN1 mechanisms? (a) Rate = k[Alkyl Halide] [Nucleophile] (b) Rate = k[Nucleophile] (c) Rate = k[Alkyl Halide] (d) Rate = k1[Alkyl Halide] + k2[Nucleophile]

Last Answer : Rate = k[Alkyl Halide]

Which of the following statements concerning SN2 reactions of alkyl halides is not correct? (a) The rate of reaction depends on the concentration of the nucleophile. (b) The rate of reaction depends on the concentration of the alkyl halide. (c) The rate of reaction of a particular alkyl bromide depends on the steric accessibility of the carbon of the C-Br bond. (d) All alkyl iodides react more rapidly than all alkyl chlorides

Description : Which of the following statements concerning SN2 reactions of alkyl halides is not correct? (a) The rate of reaction depends on the concentration of the nucleophile. (b) The rate of reaction depends on the ... carbon of the C-Br bond. (d) All alkyl iodides react more rapidly than all alkyl chlorides

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How should CH3CHClCH2CH3 be classified? (a) primary alkyl halide (b) secondary alkyl halide (c) tertiary alkyl halide (d) quarternary alkyl halide

Description : How should CH3CHClCH2CH3 be classified? (a) primary alkyl halide (b) secondary alkyl halide (c) tertiary alkyl halide (d) quarternary alkyl halide

Last Answer : secondary alkyl halide

Which of the following is a secondary alkyl halide? (a) CH3Br(b) (CH3)3CBr (c) (CH3)2CHBr (d) (CH3)2CHCH2Br

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Last Answer : (CH3)2CHBr

Which of the following statements is correct for a saturated alkyl halide? (a) the C–X bond results from overlap of the s orbital of carbon and the p orbital of the halogen (X) (b) the C–X bond results from overlap of the p orbital of carbon and the p orbital of the halogen (X) (c) the C–X bond results from overlap of the sp3 orbital of carbon and the p orbital of the halogen (X) (d) the C–X bond results from overlap of the sp2 orbital of carbon and the p orbital of the halogen (X)

Description : Which of the following statements is correct for a saturated alkyl halide? (a) the C-X bond results from overlap of the s orbital of carbon and the p orbital of the halogen (X) (b) the C-X bond ... the C-X bond results from overlap of the sp2 orbital of carbon and the p orbital of the halogen (X)

Last Answer : the C–X bond results from overlap of the sp3 orbital of carbon and the p orbital of the halogen (X)

Which of the following factors influence whether a reaction will proceed by an SN1, SN2, E1, or E2 mechanism? (a) Structure of the alkyl halide (b) Solvent (c) Concentration of reagents (d) Nature of the nucleophile (e) All of these

Description : Which of the following factors influence whether a reaction will proceed by an SN1, SN2, E1, or E2 mechanism? (a) Structure of the alkyl halide (b) Solvent (c) Concentration of reagents (d) Nature of the nucleophile (e) All of these

Last Answer : All of these

On bromination, the electron rich phenoxide ion will be attacked most readily

Description : On bromination, the electron rich phenoxide ion will be attacked most readily

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Which of the following is correct for stability of phenoxide ion?

Description : Which of the following is correct for stability of phenoxide ion?

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Which of the following is not a correct statement concerning the FriedelCrafts acylation of benzene? (a) An alkyl group substitutes for a hydrogen. (b) The benzene ring attacks an acylium ion. (c) The acylium ion is resonance stabilized. (d) The acylium ion is often produced from an acyl chloride.

Description : Which of the following is not a correct statement concerning the FriedelCrafts acylation of benzene? (a) An alkyl group substitutes for a hydrogen. (b) The benzene ring attacks an acylium ion. (c) The acylium ion is resonance stabilized. (d) The acylium ion is often produced from an acyl chloride.

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Assertion(A): Ethyl alcohol is soluble in organic solvents Reason (R): Ethyl alcohol is having non polar ethyl group

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What types of substances will dissolve in polar solvents?

Description : What types of substances will dissolve in polar solvents?

Last Answer : As a rule polar solutes are dissolved in polar solvents.

Most covalent compounds (a) Behave like electrolytes in the molten state (b) Have high melting and boiling points (c) Are hard substances because of strong covalent bonds (d) Are more soluble in non-polar solvents than in polar solvents

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Last Answer : Ans:(d)

Antioxidants are added to rubber to protect it from the attack of light, heat & atmospheric ozone. Which of the following is an antioxidant used in rubber? (A) Carbon (B) Alkylated diphenyl amine (C) Thiokol (D) Magnesium

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Which of the following best describes the carbon-chlorine bond of an alkyl chloride? (a) nonpolar; no dipole (b) polar; δ+ at carbon and δ– at chlorine (c) polar; δ– at carbon and δ+ at chlorine (d) ionic

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The most popular and common detergent i.e., alkyl benzene sulfonate (ABS) is a/an __________ detergent. (A) Cationic (B) Anionic (C) Amphoteric (D) Semi polar

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Which of the following statement(s) is/are true concerning cellular ion channels? a. Ion channels are transmembrane proteins that form pores that can conduct ions across the plasma membrane b. Ion channels are formed by membrane-spanning peptides that are arranged so that polar moieties line a central core c. Ion channel proteins undergo conformational changes between open states and closed states d. Ion channels can be blocked

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Polar moment of inertia is a.Applicable to masses whereas moment of inertia is applicable to area only b.The moment of inertia for an area ralative to a line or axis which is out the plane of area c.Same as moment of inertia d.The moment of inertia for an area relative to a line or axis parallel to the centroidal axis e.The moment of inertia for an area relative to a line or axis perpendicular to the plane of the area

Description : Polar moment of inertia is a.Applicable to masses whereas moment of inertia is applicable to area only b.The moment of inertia for an area ralative to a line or axis which is out the plane of area ... The moment of inertia for an area relative to a line or axis perpendicular to the plane of the area

Last Answer : e. The moment of inertia for an area relative to a line or axis perpendicular to the plane of the area

Pick out the wrong statement. (A) Alkylation produces a larger iso-paraffin (having higher octane number) from the reaction of an olefin with smaller iso-paraffin (B) Catalytic alkylation processes use HF, AlCl3 & H2SO4 as Catalysts (C) All the alkylation processes use very high temperature (> 1000°C) (D) Gasoline having an octane number of 90 can be produced by alkylation process

Description : Pick out the wrong statement. (A) Alkylation produces a larger iso-paraffin (having higher octane number) from the reaction of an olefin with smaller iso-paraffin (B) Catalytic alkylation processes use HF ... (> 1000°C) (D) Gasoline having an octane number of 90 can be produced by alkylation process

Last Answer : (C) All the alkylation processes use very high temperature (> 1000°C)

Sodium phenoxide when heated with `CO_(2)` under pressure at `125^(@) C` yield a product which on acetylation gives product `C`

Description : Sodium phenoxide when heated with `CO_(2)` under pressure at `125^(@) C` yield a product which on acetylation gives product `C`

Last Answer : Sodium phenoxide when heated with `CO_(2)` under pressure at `125^(@) C` yield a product which on acetylation gives product `C` A. B. C. D.

Sodium phenoxide when heated with `CO_(2)` under pressure at `125^(@) C` yield a product which on acetylation gives product `C`

Description : Sodium phenoxide when heated with `CO_(2)` under pressure at `125^(@) C` yield a product which on acetylation gives product `C`

Last Answer : Sodium phenoxide when heated with `CO_(2)` under pressure at `125^(@) C` yield a ... B. salicyladehyde C. sodium benzoate D. sodium salicylate

Which one is formed when sodium phenoxide is heated with ethyl iodide?

Description : Which one is formed when sodium phenoxide is heated with ethyl iodide?

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Sodium benzoate on heating with soda-lime gives : (a) Sodium phenoxide (b) Benzene (c) Benzaldehyde (d) Benzophenone

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Sodium phenoxide reacts with CO2 at 125°C under 5 atm pressure to give salicylic acid. This reaction is called (a) Kolbe's reaction (b) Perkin reaction (c) Wurtz reaction (d) HVZ reaction

Description : Sodium phenoxide reacts with CO2 at 125°C under 5 atm pressure to give salicylic acid. This reaction is called (a) Kolbe's reaction (b) Perkin reaction (c) Wurtz reaction (d) HVZ reaction

Last Answer : Kolbe's reaction

The greater acidity of carboxylic acids compared to alcohols arises primarily from : (a) the electron-donating effect of the hydroxyl group (b) the electron-withdrawing effect of the carboxyl oxygen (c) the acidity of α-hydrogens of carboxylic acids (d) the resonance stability associated with the carboxylate ion

Description : The greater acidity of carboxylic acids compared to alcohols arises primarily from : (a) the electron-donating effect of the hydroxyl group (b) the electron-withdrawing effect of the carboxyl ... of α-hydrogens of carboxylic acids (d) the resonance stability associated with the carboxylate ion

Last Answer : the resonance stability associated with the carboxylate ion

Pick out the wrong statement regarding the solubility characteristics of high polymers. (A) Greater the degree of cross-linking in the polymer, lesser is its solubility (B) Polymers having more aliphatic character are more soluble in aliphatic solvents, while those polymers having more aromatic character are more soluble in aromatic solvents (C) Swelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent (D) High molecular weight polymers on dissolving gives solution of very low viscosity

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Last Answer : (D) High molecular weight polymers on dissolving gives solution of very low viscosity

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

Pick out the wrong statement. (A) At constant pressure, solubility of a gas in a liquid diminishes with rise in temperature (B) Normally, the gases which are easily liquefied are more soluble in common solvents (C) The gases which are capable of forming ions in aqueous solution are much more soluble in water than in other solvents (D) At constant pressure, solubility of a gas in a liquid increases with rise in temperature

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Last Answer : (A) At constant pressure, solubility of a gas in a liquid diminishes with rise in temperature

Which of the following terms denotes the polar molecules or negative ions clustered about a central positive ion? w) ligands x) isomers y) complex ions z) dipoles

Description : Which of the following terms denotes the polar molecules or negative ions clustered about a central positive ion? w) ligands x) isomers y) complex ions z) dipoles

Last Answer : ANSWER: W -- LIGAND

What is the name given to a polar molecule or negative ion that is clustered about a central positive ion?

Description : What is the name given to a polar molecule or negative ion that is clustered about a central positive ion?

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The theory of interionic attraction attributed to Debye and Hückel: w) was disproved by Arrhenius x) accounts quantitatively for the attraction between ions in dilute aqueous solutions y) does not account for kindered "ion-activity" z) accounts for intra-molecular polar bonds

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Last Answer : ANSWER: X -- ACCOUNTS QUANTITATIVELY FOR THE ATTRACTION BETWEEN IONS IN DILUTE AQUEOUS SOLUTIONS

What single isomer would be found in greatest yield when isopropyl chloride undergoes a Friedel-Crafts alkylation with t-butylbenzene ?

Description : What single isomer would be found in greatest yield when isopropyl chloride undergoes a Friedel-Crafts alkylation with t-butylbenzene ?

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In catalytic alkylation, higher iso-butane to olefin ratio gives (A) Low final boiling point product (B) Higher yield (C) Both (A) and (B) (D) Neither (A) nor (B

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Last Answer : (A) Low final boiling point product

Which one of the following processes aims at producing higher yield of gaseous unsaturated hydrocarbons and aromatics like benzene & toluene? (A) Reforming (B) Pyrolysis (C) Alkylation (D) Hydrocracking

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Last Answer : (A) Reforming

Alkylation (A) Causes olefins to combine with each other(B) Causes olefins to combine with iso-paraffins(C) Converts iso-paraffin into olefin(D) Converts olefin into paraffin

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Last Answer : (B) Causes olefins to combine with iso-paraffins

__________ converts n-paraffins to i-paraffins. (A) Alkylation (B) Polymerisation (C) Isomerisation (D) None of these

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In petroleum refining, the process used for conversion of hydrocarbons to aromatics is (A) Catalytic cracking (B) Catalytic reforming (C) Hydrotreating (D) Alkylation

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Last Answer : (A) Sulphuric acid