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 $\left( CH _{3} CONH _{2}\right)$, due to H-bonding has the highest boiling point. Boiling point varies directly with size. Thus, the order of boiling point is

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