Among the given cations, the most stable carbonium ion is

sec-butyl

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tert-butyl

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n-butyl

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None of these

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Solution

The correct option is B tert-butyl
$Stability of carbonium ions (carbocations) \propto Number of α -H$
tert-butyl has $9 - α H$
sec-butyl has $5 - α H$
n-butyl has $2 - α H$
Hence the stability order will be:
$(C H_{3})_{3} C^{+} > C H_{3} - C H_{2} - + C H - C H_{3} > C H_{3} - C H_{2} - C H_{2} - C H_{2}^{+}$

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