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

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