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Hyperconjugation

Among the giv...

Question

Among the given cations, the most stable carbonium ion is:

A

sec-butyl cation

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B

tert-butyl cation

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C

n-butyl cation

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D

none of these

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Solution

The correct option is A tert-butyl cation
$C H_{3} - C H_{2} - C H_{2} - C H_{2}^{\oplus} α H = 2$
$C H_{3} - C H_{2} - {C H | C H_{3}}^{\oplus} α H = 5$
$C H_{3} - \oplus C H | C H_{3} - C H_{3} α H = 9$
most stable $α H = 9$ tert butyl

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