Organic Chemistry Questions and Answers – Chemical Properties of Carboxylic Acids

This set of Organic Chemistry written test Questions & Answers focuses on “Chemical Properties of Carboxylic Acids”.

1. Hydrogenation of C₆H₅CHOH−COOH over Rh−Al₂O₃ catalyst in methanol gives which of the following?
a) C₆H₅CH₂COOH
b) C₆H₁₁CHOHCOOH
c) C₆H₅CHOHCH₂OH
d) C₆H₁₁CH₂COOH
View Answer

Answer: b
Explanation: Hydrogenation of C₆H₅CHOH−COOH over Rh−Al₂O₃ catalyst in methanol gives C₆H₁₁CHOHCOOH.

2. In the anion HCOO− the two carbon-oxygen bonds are found to be of equal length. What is the reason for it?
a) Electronic orbitals of carbon atom are hybridised
b) The C = O bond is weaker than the C – O bond
c) The anion HCOO− has two resonating structures
d) The anion is obtained by removal of a proton form the acid molecule
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3. In a set of the given reactions, acetic acid yielded a product C

What would be product C?
a) CH₃−C-C₂H₅(OH)C₆H₅
b) CH₃CH(OH)C₂H₅
c) CH₃COC₆H₅
d) CH₃CH(OH)C₆H₅
View Answer

Answer: a
Explanation: In a set of the given reactions, acetic acid yielded a product C is CH₃−C-C₂H₅(OH)C₆H₅.

4. Carboxylic acids are more acidic than phenol and alcohol because of which of the following?
a) Intermolecular hydrogen bonding
b) Formation of dimers
c) Highly acidic hydrogen
d) Resonance stabilization of their conjugate base
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5. When propionic acid is treated with aqueous sodium bicarbonate CO₂ is liberated. The ‘C’ of CO₂ comes from which of the following?
a) Methyl group
b) Carboxylic acid group
c) Methylene group
d) Bicarbonate
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6. The compound not soluble in acetic acid is which of the following?
a) CaCO₃
b) CaO
c) CaC₂O₄
d) Ca(OH)₂
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7. Identify the wrong statement from the following?
a) Salicylic acid’s a monobasic acid
b) Methyl salicylate is an ester
c) Salicylic acid gives violet colour with neutral ferric chloride as well as brisk effervescence with sodium bicarbonate
d) Methyl salicylate does not occur in natural oils
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8. When CH₃COOH reacts with CH₃−Mg−X, which of the following is formed?
a) CH₃COX is formed
b) Hydrocarbon is formed
c) Acetone is formed
d) Alcohol is formed
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9. Hydrolysis of an ester gives a carboxylic acid which on Kolbe’s electrolysis yields ethane. The ester is which of the following?
a) Ethyl methonoate
b) Methyl ethanoate
c) Propylamine
d) Ethylamine
View Answer

Answer: b
Explanation: Hydrolysis of an ester gives a carboxylic acid which on Kolbe’s electrolysis yields ethane, this ester is methyl ethanoate.

10. Sulphonation of benzoic acid produces mainly which of the following?
a) o-sulphobenzoic acid
b) m-sulphobenzoic acid
c) p-sulphobenzoic acid
d) o- and p-sulphobenzoic acid
View Answer

Answer: b
Explanation: Sulphonation of benzoic acid produces mainly m-sulphobenzoic acid.

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