Question

Identify the correct order of boiling points of the following compounds
(1) $CH_3CH_2CH_2CH_2OH,$
(2) $CH_3CH_2CH_2CHO,$
(3) $CH_3CH_2CH_2COOH$

• A. $1 > 2 > 3$
• B. $3 > 1 > 2$
• C. $1 > 3 > 2$
• D. $3 > 2 > 1$

Answer 1

Answer: (B)

$-COOH$ and $-OH$ group form the hydrogen bond by which they have high boiling point. $-COOH$ group shows strong hydrogen bonding so it forms dimer and have more boiling point than $-OH$ group. While $-CHO$ group does not form hydrogen bond. Thus the reactivity order are as $3 > 1 > 2.$