The carboxyl functional group(–COOH) is present in

Engineering

Chemistry

Structure of Some Important Compounds

Question

barbituric acid

ascorbic acid

picric acid

aspirin

The carboxyl functional group is represented as $- C (= O) - O H$ and is characteristic of carboxylic acids.

Step 1: Examine barbituric acid - its structure contains carbonyl groups but lacks a free $- C O O H$ group.

Step 2: Examine ascorbic acid (Vitamin C) - it contains enol groups and lactone ring, not a standard carboxyl group.

Step 3: Examine picric acid - it contains nitro groups and phenolic $- O H$ , but no carboxyl group.

Step 4: Examine aspirin (acetylsalicylic acid) - its structure clearly contains a carboxyl group: $C H_{3} C (= O) O - C H_{4} - C O O H$

Final Answer: Aspirin contains the carboxyl functional group.

Carboxylic Acids: Organic compounds containing the $- C O O H$ functional group. They are weak acids that can donate a proton.

General formula for carboxylic acids: $R - C O O H$

Acid dissociation constant: $K_{a} = \frac{[H^{+}] [R C O O^{-}]}{[R C O O H]}$

Detailed Solution