Q.

Stabitlity of carbocation depends various electronic effects. Least stable carbocation among the following is

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a

O2N−C+H2

b

OHC−C+H2

c

H3CO−C+H2

d

H3C−C+H2

answer is A.

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Detailed Solution

1)Electron withdrawing power of  −NO2>−CHO      EWG ↓ the stability of carbocation by intensifying the positive charge2)Electron donating power of  −OCH3>−CH3 EDG ↑ the stability of carbocation by dispersing the positive charge∴  Stability of 1 < 2 < 4 < 3
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