JEE MAIN - Chemistry (2025 - 2nd April Morning Shift - No. 18)
The correct order of basic nature in aqueous solution for the bases $\mathrm{NH}_3, \mathrm{H}_2 \mathrm{~N}-\mathrm{NH}_2, \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{NH}_2,\left(\mathrm{CH}_3 \mathrm{CH}_2\right)_2 \mathrm{NH}$ and $\left(\mathrm{CH}_3 \mathrm{CH}_2\right)_3 \mathrm{~N}$ is :
$\mathrm{NH}_3<\mathrm{H}_2 \mathrm{~N}-\mathrm{NH}_2<\left(\mathrm{CH}_3 \mathrm{CH}_2\right)_3 \mathrm{~N}<\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{NH}_2<\left(\mathrm{CH}_3 \mathrm{CH}_2\right)_2 \mathrm{NH}$
$\mathrm{H}_2 \mathrm{~N}-\mathrm{NH}_2<\mathrm{NH}_3<\left(\mathrm{CH}_3 \mathrm{CH}_2\right)_3 \mathrm{~N}<\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{NH}_2<\left(\mathrm{CH}_3 \mathrm{CH}_2\right)_2 \mathrm{NH}$
$\mathrm{NH}_2-\mathrm{NH}_2<\mathrm{NH}_3<\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{NH}_2<\left(\mathrm{CH}_3 \mathrm{CH}_2\right)_3 \mathrm{~N}<\left(\mathrm{CH}_3 \mathrm{CH}_2\right)_2 \mathrm{NH}$
$\mathrm{NH}_3<\mathrm{H}_2 \mathrm{~N}-\mathrm{NH}_2<\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{NH}_2<\left(\mathrm{CH}_3 \mathrm{CH}_2\right)_2 \mathrm{NH}<\left(\mathrm{CH}_3 \mathrm{CH}_2\right)_3 \mathrm{~N}$
Explanation
Basic strength of amine depends on hydrogen bonding and electronic inductive effect.
$\mathrm{NH}(\mathrm{Et})_2>\mathrm{N}(\mathrm{Et})_3>\mathrm{NH}_2 \mathrm{Et}>\stackrel{\bullet\bullet}{\mathrm{NH}_3}>\mathrm{NH}_2-\mathrm{NH}_2$
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