JEE Main · 2024 · 01 Feb 2024 · Shift 2 · Chemical Bonding and Molecular Structure

Which among the following has highest boiling point?

(A) $CH_{3} CH_{2} CH_{2} CH_{3}$
(B) $CH_{3} CH_{2} CH_{2} CH_{2} - OH$ ✓ Correct
(C) $CH_{3} CH_{2} CH_{2} CHO$
(D) $H_{5} C_{2} - O - C_{2} H_{5}$

Answer: (B)

Solution

n-Butane has only weak London dispersion forces between its molecules. Butanal and diethyl ether are polar but have no O–H or N–H bond, so they interact only through dipole–dipole forces. 1-Butanol carries an

- O H

group that forms strong intermolecular hydrogen bonds, requiring far more energy to separate the molecules on boiling. This hydrogen bonding gives 1-butanol the highest boiling point among the four.

JEE Main · 2024 · 01 Feb 2024 · Shift 2 · Single correct option

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