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Question

Among the given cations, .................. is most stable. (sec-butyl carbonium ion, tert - butyl carbonium ion, n-butyl carbonium ion and iso-butyl carbonium ion)

A
t - Butyl carbonium ion
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B
sec-butyl carbonium ion
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C
n-butyl carbonium ion
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D
iso-butyl carbonium ion
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Solution

The correct option is B t - Butyl carbonium ion
Among the given cations, (sec-butyl carbonium ion, tert - butyl carbonium ion, n-butyl carbonium ion) t - Butyl carbonium ion is most stable.
This is because, methyl group has + I effect and stabilizes the positive charge.
In tert butyl carbonium ion, three methyl groups are attached to C atom bearing positive charge which results in maximum stability.
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