Question

The order of increasing boiling points of
I. acetyl chloride;
II. acetic anhydride;
III. acetamide;
IV. acetic acid is

• A. $IV>I>II>III$
• B. $I>IV>II>III$
• C. $II<I<III<IV$
• D. $I<IV<II<III$

Answer 1

Answer: (D)

Acetamide $\left(C{H}_{3}CON{H}_2\right)$, due to H-bonding has the highest boiling point. Boiling point varies directly with size. Thus, the order of boiling point is

$\underset{(I)}{\text{acetyl chloride}}<\underset{(IV)}{\text{acetic acid}}<\underset{(II)}{\text{acetic anhydride}}<\underset{(III)}{\mathrm{acetamide}}$