Arrange the carbonions,
`(CH_(3))_(3)overset(-)C, overset(-)C Cl_(3), (CH_(3))_(2) overset(-)CH, C_(6)H_(5)overset(-)CH_(2)` in order of their decreasing stability

Options

A. `C_(6)H_(5)bar(C)H_(2)gtbar(C)Cl_(3)gt(CH_(3))_(2)bar(C)gt(CH_(3))_(2)bar(C)H`
B. `(CH_(3))_(2)bar(C)Hgtbar(C)Cl_(3)gtC_(6)H_(5)bar(C)H_(2)gt(CH_(3))_(2)bar(C)`
C. `bar(C)Cl_(3)gtC_(6)H_(5)bar(C)H_(2)gt(CH_(3))_(2)bar(C)Hgt(CH_(3))_(3)bar(C)`
D. `(CH_(3))_(2)bar(C)gt(CH_(3))_(2)bar(C)Hgtbar(C)H_(2)gtbar(C)Cl_(3)`

Answer

C

Explanation

`-I` effect [`e^(-)` withdrawing] exerting groups stablise carbanion by the dispersal of their -ve charge while `+I` effect exerting [`e^(-)` releasing] groups destabilise the carbanion by increasing electron density on them. On the other hand, resonance stabilised carbanion are stable due to the involvement of their lone pair of electron with the delocalization of `pi`-electrons of attached phenyl group. Thus,