JEE Main 2026 Apr 6 Shift 1, Chemistry Q18: Properties of Alcohol

JEE Main2026Apr 6, Shift 1Chemistry

Arrange the following compounds according to increasing order of boiling points.

$n -C_{4} H_{9} OH$ (A), $n -C_{4} H_{9} NH_{2}$ (B), $n -C_{4} H_{10}$ (C) and $C_{2} H_{5} NHC_{2} H_{5}$ (D).

A
C $<$ B $<$ A $<$ D
B
D $<$ C $<$ B $<$ A
C
C $<$ D $<$ B $<$ A
D
D $<$ B $<$ A $<$ C

Solution

Boiling points scale with intermolecular forces. All four compounds have similar molar mass, so the discriminator is the strength and extent of H-bonding.

$n$ -butane (C): only weak dispersion forces $\to$ lowest bp.

Diethylamine (D): secondary amine, $N-H$ allows one H-bond per molecule, but only one H on N, so weak H-bonding network.

$n$ -butylamine (B): primary amine with two N-H bonds, more extensive H-bonding than secondary amine.

$n$ -butanol (A): O-H bond stronger and more electronegative than N-H, gives the most extensive and strongest H-bonding $\to$ highest bp.

$∴$ C $<$ D $<$ B $<$ A.

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JEE Main 2026 Apr 6 Shift 1, Chemistry Q18: Properties of Alcohol

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