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Carboxylic acids MCQs and Answers with explanation

Carboxylic acids MCQs and Answers with explanation

1. A carboxylic acid contains functional group





... Answer is b)
Explanation: Carboxylic acid is a class of compounds which have carboxyl group (COOH) as a functional group.

2. From the following carboxylic acids which acid has higher acidity





... Answer is d)
Explanation: Acidity of an acid depends upon the stability of its conjugate base. As conjugate base of nitroethanoic acid is highly stable (due to strong electron withdrawing effect of nitro group), so it is the strongest acid among the given options.

3. which reagent is used to reduce a carboxylic acid?





... Answer is d)
Explanation: H2/Ni is used to reduce an alkene and alkynes. NaBH4 is a weak reducing agent and it is used to reduce only aldehydes which are highly reactive. LiAlH4 is a strong reducing agent and it is used to reduce aldehyde, ketones and carboxylic acids. He/Ni is not a reducing agent.

4. Strongest acid is





... Answer is b)
Explanation: Formic acid (HCOOH) is the strongest acid because its conjugate base is stablized. Conjugate base of all other acids are destablized due to electron donating effect of alkyl group. These electron donating alkyl groups increase the electron density at their respective carboxylate ions (COO-) and make these ions unstable. As a resul these carboxylate ions become strong conjugate bases. so their respective acids become weaker acid.

5. Acetamide is prepared by





... Answer is a)
Explanation: Acetamide is prepared by heating ammonium acetate.

6. Carboxylic acids react with metal to form salts with evolution of


... Answer is b)
Explanation: As metals have strong reducing ablility, so they can easily reduce acidic proton to hydrogen gas.

7.Ethane-1,2-dioic acid is also called





... Answer is b)
Explanation: Ethane-1,2-dioic acid is also called oxalic acid (HOOC-COOH).

8. Carboxylic acid can be prepared by the action of Grignard reagent with





... Answer is b)
Explanation: Grignard reagent adds up to one of pi bonds of CO2 to form an intermediate. Then acid hydrolysis leads to formation of carboxylic acid.

9. The IUPAC name for formic acid is





... Answer is a)
Explanation: The IUPAC name for formic acid is methanoic acid.

10. The reaction of alcohol with acetic acid is known as





... Answer is b)
Explanation: As reaction of acetic acid with an alcohol produces an ester. So, this reaction is known as esterification.

11.Esters are formed by the reaction of carboxylic acids with





... Answer is a)
Explanation: Esters are formed by the reaction of carboxylic acids with an alcohol.

12. Which one of the following has both hydroxyl and carboxylic acid groups





... Answer is d)
Explanation: Salicylic acid has both hydroxyl group and carboxylic group.

13. Which one of the following cannot be prepared directly from acetic acid





... Answer is a)
Explanation: Reaction of acetic acid and ammonia first gives ammonium acetate which results in formation of acetamide on heating.

14. Reaction between caustic soda and a fat is called





... Answer is d)
Explanation: Reaction of caustic soda and fat produces soap. So, this reaction is known as saponification.

15. When a carboxylic acid reacts with alcohol, it produces a new class of compounds





... Answer is b)
Explanation: When a carboxylic acid reacts with alcohol, it produces a new class of compounds known as esters.
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