Which of the following carbocation is most stable?
(a) $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C} . \stackrel{+}{\mathrm{C}} \mathrm{H}_{2}$
(b) $\left(\mathrm{CH}_{3}\right)_{3} \stackrel{+}{\mathrm{C}}$
(c) $\mathrm{CH}_{3} \mathrm{CH}_{2} \stackrel{+}{\mathrm{C}} \mathrm{H}_{2}$
(d) $\mathrm{CH}_{3} \stackrel{+}{\mathrm{C}} \mathrm{H} \mathrm{CH}_{2} \mathrm{CH}_{3}$
$\left(\mathrm{CH}_{3}\right)_{3}{ }_{\mathrm{C}}^{+}$is a tertiary carbocation. A tertiary carbocation is the most stable carbocation due to the electron releasing effect of three methyl groups. An increased $+$ I effect by three methyl groups stabilizes the positive charge on the carbocation.
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