Which of the following classes of compounds on hydrolysis yields carboxylic acids?

(A) $RCN$
(B) $RCONH_2$
(C) $RCOCl$
(D) $RCOOR$

Choose the correct answer from the options given below:

(A), (B), (C) and (D)

The correct answer is Option (3) → (A), (B), (C) and (D)

Detailed Explanation:

All four functional groups are derivatives of carboxylic acids and undergo hydrolysis to give the parent carboxylic acid.