Question

Which of the following gives ester test? (i)Alcohol (ii) Secondary amine (iii) Aldehyde (iv) Carboxylic acid
a. (i) and (iii) b. (i) and (iv)
c. (i) d. (iv)

Answer 1

Answer:

Which of the following gives ester test?

b. (i) and (iv)

Answer 2

Answer:

The correct answer is option (b) (i) and (iv).

Explanation:

(i) Alcohol:

• Alcohol gives ester test positive.
• It gives fruity smell by reacting with glacial acetic acid and 2-3 drops of concentrated sulphuric acid which confirms the presence of alcoholic group.

(ii) Secondary amine:

• Aliphatic and aromatic amines give ester test positive.
• But, secondary and tertiary amines do not give this test.

(iii) Aldehyde:

• Aldehyde do not give ester test.

(iv) Carboxylic acid:

• Carboxylic acid reacts with alcohol and concentrated sulphuric acid and form the ester.
• It gives pleasant smell of ester.
• Thus, carboxylic acid gives ester test positive.

So, alcohol and carboxylic acid give ester test positive.

Hence, option (b) is the correct answer.

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