Compare the stability of the carbocations formed when the following iodides react with $AgN O_{3}$ .
(a) (b) (c)

Question

Compare the stability of the carbocations formed when the following iodides react with AgN O 3 ​ . (a) (b) (c)

TestHub · Accepted Answer

(a) gives the tropylium cation (6π, aromatic) : the most stable. (b) gives the allyl cation, stabilised by ordinary resonance. (c) gives the planar cyclohexadienyl cation with 4 π electrons in the ring : anti-aromatic and the least stable. Order : a > b > c.

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