Arrange the following carbocation in decreasing order of stability.
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a
I > III > II > IV
b
II > I > III > IV
c
IV > III > II > I
d
III > IV > II > I
answer is B.
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Detailed Solution
II is stabilized by resonance effect, most stable followed by I which is stabilized only by inductive and hyperconjugation effect. IV is least stable due to greater electron withdrawing power of −NO2 than −CN.