CBSE 2025 · Region 6 · Set 2 · Q15 · 1 mark
Assertion (A) : Boiling point of $\displaystyle \left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{2} \mathrm{NH}$ is lower than that of $\displaystyle \mathrm{n}-\mathrm{C}_{4} \mathrm{H}_{9} \mathrm{NH}_{2}$.
Reason (R) : Hydrogen bonding is much more extensive in $\displaystyle \mathrm{n}-\mathrm{C}_{4} \mathrm{H}_{9} \mathrm{NH}_{2}$ as compared to $\displaystyle \left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{2} \mathrm{NH}$.
Official answer
From CBSE’s own marking scheme for this paper.
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
AminesPhysical Properties of AminesAnalyseassertion_reasonmedium
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CBSE Class 12 Chemistry past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.