1000 Multiple-Choice Questions in Organic Chemistry by Organic Chemistry Academy

Author:Organic Chemistry Academy
Language: eng
Format: azw3
Publisher: Organic Chemistry Academy
Published: 2015-03-03T05:00:00+00:00

(a) (1) > (2) > (3)

(b) (3) > (2) > (1)

(c) (3) > (1) > (2)

(d) (2) > (1) > (3)

Answer. (b)

524. Which of the following is the strongest acid?

(a) Formic acid

(b) Trichloroacetic acid

(c) Acetic acid

(d) Trifluoroacetic acid

Answer. (d)

525. Which of the following is the strongest acid?

(a) Butanoic acid

(b) 2-Chlorobutanoic acid

(c) 3-Chlorobutanoic acid

(d) 4-Chlorobutanoic acid

Answer. (b)

526. Which of the following is the strongest acid in aqueous solution?

(a) CH3COOH

(b) ClCH2COOH

(c) CH3CH2COOH

(d) Cl2CHCOOH

Answer. (d)

527. Which is the strongest acid?

(a) CH3COOH

(b) Cl2CHCOOH

(c) ClCH2COOH

(d) Cl3CCOOH

Answer. (d)

528. Which of the following compounds is most acidic?

(a) CH3COOH

(b) ClCH2COOH

(c) CH3CH2COOH

(d) FCH2COOH

Answer. (d)

529. Which of the following compounds is the strongest acid?

(a) CH3COOH

(b) CH3CH2COOH

(c) CF3COOH

(d) CH3CH2CH2COOH

Answer. (c)

530. Which of the following compounds is least acidic?

(a) CH3CH2COOH

(b) BrCH2CH2COOH

(c)

(d)

Answer. (a)

531. Which of the following compounds is most acidic?

(a) CH3CH2COOH

(b) BrCH2CH2COOH

(c)

(d)

Answer. (d)

532. Which of the following will give acetic acid on acid-hydrolysis?

(a) Ethyl acetate

(b) Acetone

(c) Methyl propionate

(d) Lactic acid

Answer. (a)

533. Propanenitrile undergoes acid-hydrolysis to give

(a) Formic acid

(b) Propionic acid

(c) Acetic acid

(d) Butyric acid

Answer. (b)

534. The characteristic reaction of carboxylic acids is :

(a) electrophilic addition

(b) electrophilic substitution

(c) nucleophilic addition

(d) nucleophilic substitution

Answer. (d)

535. Which of the following compounds will react with Tollens' reagent to give metallic silver?

(a) Formic acid

(b) Ethyl alcohol

(c) Acetic acid

(d) Acetone

Answer. (a)

536. Which of the following compounds on treatment with NaHCO3 will liberate CO2?

(a) Acetic acid

(b) Ethylamine

(c) Acetone

(d) Ethyl alcohol

Answer. (a)

537. Which of the following reagents will convert acetic acid into acetyl chloride?

(a) NaCl

(b) HCl/ZnCl2

(c) SOCl2

(d) HCl

Answer. (c)

538. Butyric acid reacts with PCl5 to give

(a) Benzoyl chloride

(b) 1-Chlorobutane

(c) Butyryl chloride

(d) 1-Chloropropane

Answer. (c)

539. Acetic acid undergoes reduction with LiAlH4 to give

(a) Ethanol

(b) Ethane

(c) Ethanal

(d) Ethyne

Answer. (a)

540. Acetic acid reacts with methyl alcohol in the presence of an acid catalyst to give

(a) Methyl formate

(b) Ethyl formate

(c) Methyl acetate

(d) Ethyl acetate

Answer. (c)

541. Calcium acetate on strong heating gives

(a) Methane + CaCO3

(b) Ethane + CaCO3

(c) Acetone + CaCO3

(d) Ethane + CaO

Answer. (c)

542. CH3(CH2)4 is the sodium salt of hexanoic acid. The water solubility of this salt is :

(a) higher than that of hexanoic acid

(b) lower than that of hexanoic acid

(c) completely insoluble

(d) not predictable

Answer. (a)

543. Which of the following compounds has the lowest boiling point?

(a) 1-butanol

(b) butanoic acid

(c) butanenitrile

(d) methyl propanoate

Answer. (c)

544. Which of the following is the correct ranking in decreasing order of relative Boiling Point of carbonyl containing compounds?

(a) primary amide > carboxylic acid >> ester ~ acyl chloride ~ aldehyde ~ ketone

(b) ester > carboxylic acid >> amide ~ acyl chloride ~ aldehyde ~ ketone

(c) aldehyde ~ ketone > carboxylic acid >> ester ~ acyl chloride ~ amide

(d) carboxylic acid > amide >> ester ~ acyl chloride ~ aldehyde ~ ketone

Answer. (a)

545. Acetyl chloride undergoes nucleophilic substitution at a faster rate than methyl acetate because __________.

(a) the ester is more sterically hindered than the acid chloride

(b) the acid chloride is more sterically hindered than the ester

(c) the methoxide is a better leaving group than chloride

(d) chloride is a better leaving group than methoxide

Answer. (d)

546. Esters and amides are most easily made by nucleophilic acyl substitution reactions on :

(a) acid anhydrides

(b) carboxylates

(c) carboxylic acids

(d) acid chlorides

Answer. (d)

547. Which of the following conditions will drive the equilibrium of the Fischer esterification towards ester formation?

(a) addition of water

(b) removal of water as it is formed

(c) addition of alcohol

(d) both (b) and (c)

Answer. (d)

548. 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.

Answer. (a)

549. Ammonium acetate on strong heating gives

(a) Urea

(b) Formamide

(c) Uric acid

(d) Acetamide

Answer. (d)

550. 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

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