The carboxyl functional group $(-\mathrm{COOH})$ is present in

JEE Advanced · 2012 · 08 Apr 2012 · Paper 1 · Aldehydes Ketones and Carboxylic Acids

The carboxyl functional group

(- COOH)

is present in

(A)picric acid
(B)barbituric acid
(C)ascorbic acid
(D)aspirin✓ Correct

Answer: (D)

Solution

The carboxyl group (

- COOH

) is present in aspirin (acetylsalicylic acid), which has the structure with both an acetyl ester group and a carboxylic acid group. Picric acid is 2,4,6-trinitrophenol (contains

- OH

and

- NO_{2}

groups). Barbituric acid is a cyclic compound with carbonyl groups but no free carboxyl group. Ascorbic acid (vitamin C) is a lactone with enediol groups but no carboxyl group. Only aspirin contains the

- COOH

functional group.

JEE Advanced · 2012 · 08 Apr 2012 · Paper 1 · Single correct option

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