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Question

Rank the following cations in decreasing order of stability.
(CH3)2CHCH2C+H2
CH3C+HCH(CH3)2
CH3C+(CH3)CH2CH3

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Solution

CH3CH|+1CH2+CH2
CH3 (A)
CH3
CH3+1+1CH+1|CH|
(B) CH3

+1CH3+C+1CH2CH3
CH3+1 (C)
The Hyper conjugation and positive inductive effect is more in compound 3rd which increases the stability of carbocation.
Decrease order of stability-
CH3 CH3
CH3+C||CH2>CH3+CH|CH|>CH3CH|CH2+CH2
CH3 CH3 CH3

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