In which pair is the second ion more stable than the first ?
(A) and
(B) and
(C) and
(D) and

Question

In which pair is the second ion more stable than the first ? (A) and (B) and (C) and (D) and

TestHub · Accepted Answer

(A) the cyclopropenyl cation (2π, aromatic) is more stable than the anion (4π, anti-aromatic), so the second is less stable. (B) the cyclopentadienyl anion (6π, aromatic) is more stable than the cation (4π, anti-aromatic) : second is more stable. (C) the cycloheptatrienyl cation (6π, aromatic) is more stable than the anion (8π) : second is more stable. (D) the OH group stabilises the cation by +M donation of its lone pair, so the first is more stable. Correct : B and C.

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