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Q.

In the following carbocations, the stability order is:

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a

III > II > IV > I

b

IV > I > II > III

c

IV > III > II > I

d

III > IV > II > I

answer is A.

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Detailed Solution

Cyclopropyl methyl carbocation is more stable than benzyl carbocation due to overlapping of cyclopropyl ring's bond to vacant p-orbital at carbocation which leads to ring expansion. hence (III) is more stable than (I).

stability of  (IV) > (I)  due to resonance in (IV) 

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