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JEE Main levelSingle correct optionDifficulty 2 of 3g1185

Which of the following carbocations is the most stable?

A $CH X_{3} - O - CH X_{2} X^{+}$
B $CH X_{3} X^{+}$
C $CH X_{3} CH X_{2} X^{+}$
D $CH X_{3} CH X_{2} CH X_{2} X^{+}$

Answer: A

In

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

the lone pair on oxygen is donated to the cationic carbon (

CH X_{3} - O X^{+} = CH X_{2}

), giving every atom an octet. This +M stabilisation outweighs hyperconjugation in the primary alkyl cations.

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