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JEE Main levelSingle correct optionDifficulty 2 of 3g1178

Which of the following carbocations is the least stable?

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

Answer: D

The strongly electron withdrawing

CF X_{3}

group (-I) intensifies the positive charge on the adjacent carbon, whereas alkyl groups reduce it. So

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

is the least stable.

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