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The most stable carbocation, among the following is
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$\mathrm{CH}_3-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_3$
$\mathrm{CH}_3 \stackrel{+}{\mathrm{C}} \mathrm{H} \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_3$ is the most stable carbocation among the given carbocations. It is because the number of $\alpha$ - $\mathrm{H}$ atom attached to carbocation is maximum in $\mathrm{CH}_3 \stackrel{+}{\mathrm{C}} \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_3$. Thus, it has maximum number of hyperconjugating structure hence, it is most stable.
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