Q.

The stability order of the following carbocations(I) (II)(III) CH2=CH-C+H2(IV) CH3+

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a

I > II > III > IV

b

IV > III > II > I

c

I > III > II > IV

d

IV > I > III > II

answer is A.

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Detailed Solution

II, III are stable due to resonance effect. The extra stability of option-I is due to conjugation with bend orbital of cyclopropyl ring and vacant p-orbital of carbocation. This result in the disappearance of the positive charge, increasing the stability.
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