JEE Main · 2022 · 24 Jun 2022 · Shift 2 · General Organic Chemistry

Arrange the following carbocations in decreasing order of stability.

(A)A > C > B
(B)A > B > C✓ Correct
(C)C > B > A
(D)C > A > B

Answer: (B)

Solution

Carbocation stability is determined by resonance and hyperconjugation. Structure A has resonance stabilization from the oxygen lone pair plus α-hydrogen hyperconjugation. Structure B has resonance from oxygen but fewer α-hydrogens. Structure C has resonance from oxygen but is less stabilized due to ring strain and position. The order is A > B > C.

JEE Main · 2022 · 24 Jun 2022 · Shift 2 · Single correct option

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