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Q.

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The carbanion is stabilized by
a) –I effect of CF3
b) +I effect of CF3
 c) d-orbital resonance of Cl atom

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a

c only

b

both b and c

c

a only 

d

both a and c

answer is C.

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Detailed Solution

  • In the carbanion CF3-CCl2⊝, fluorine is more electronegative than Cl and hence, CF3 exhibits -I effect.
  • The negative charge, indicating the electrons residing in the empty d-orbital of Chlorine, which participate in resonance to substitute the -I effect of CF3 group, thus stabilizing the carbanion.
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