The correct order of stability of following carbocation is :

(III) > (II) > (I) > (IV)

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(II) > (III) > (I) > (IV)

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(I) > (III) > (IV) > (II)

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(I) > (III) > (II) > (IV)

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Solution

The correct option is D (I) > (III) > (II) > (IV)
An electron withdrawing group stabilize a negative charge and an electron donating group stabilizes a positive charge. Cycloalkyl groups are electron donating group so they stabilize the carbocation,phenyl group has some resonance effect alongwith inductive effect so phenyl group give less stability.

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