MHT CET 2025 Chemistry question

Which from following is a correct increasing order of basic strength of compounds?

(A)(CH)NH < CHNH < (CH)N < NH
(B)NH < (CH)NH < CHNH < (CH)N
(C)CHNH < (CH)NH < (CH)N < NH
(D)NH < (CH)N < CHNH < (CH)NHCorrect

Answer: (D)

Solution

In aqueous solution the basic strength of methyl-substituted amines depends on the +I effect of the alkyl groups (increases electron density on N) and on stabilisation of the conjugate acid by hydrogen bonding and solvation (decreases with fewer N-H bonds). The combined result for methylamines is $ >

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Question ID VK-102518