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NEET levelSingle correct optionDifficulty 1 of 3g1111

Which of the following carbocations is the most stable on account of hyperconjugation?

A $CH X_{3} X^{+}$
B $(CH X_{3}) X_{2} CH X^{+}$
C $(CH X_{3}) X_{3} C X^{+}$
D $CH X_{3} CH X_{2} X^{+}$

Answer: C

Hyperconjugation needs alpha C-H bonds next to the positive carbon.

(CH X_{3}) X_{3} C X^{+}

has 9,

(CH X_{3}) X_{2} CH X^{+}

has 6,

CH X_{3} CH X_{2} X^{+}

has 3 and

CH X_{3} X^{+}

has none. The most alpha hydrogens give the most stable cation,

(CH X_{3}) X_{3} C X^{+}

.

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