Question

Identify the correct order of boiling points of the following compounds
(I) $CH_{3}CH_{2}CH_{2}CH_{2}OH$
(II) $CH_{3}CH_{2}CH_{2}CHO$
(III) $CH_{3}CH_{2}CH_{2}COOH$

• A. I > II > III
• B. III > I > II
• C. I > III > II
• D. III > II > I

Answer 1

Answer: (B)

Stronger the H-bonding, more is the boiling point. Acids have stronger H-bond than alcohols while aldehydes does not have H-bond. So the order of decreasing boiling point is III > I > II.