JEE Main Chemistry question

Assertion: A tertiary amine is less basic than a secondary amine in aqueous solution.

Reason: Overcrowding of the three alkyl groups around nitrogen increases steric strain and hinders solvation of the resulting ammonium ion.

(A)Assertion is True, Reason is True; Reason is correct explanation for AssertionCorrect
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is True

Answer: (A)

Solution

The Assertion is true: the standard aqueous basicity order for simple alkylamines is 2° > 3° > 1° > , so a tertiary amine is indeed less basic than the corresponding secondary amine in water. The Reason correctly identifies why: although three alkyl groups donate electron density

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Question ID VK-150425