Least stable benzyl carbocation among the following is
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a
b
c
d
answer is A.
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Detailed Solution
-NO2 group is EWG. It decreases the stability of carbocation.-NO2 …. ortho…… -I, -m, (maximum-I)-NO2……para…….-I. -m (minimum-I)-NO2…..meta……..-I only∴ Stability of 4>2>3>1