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Arrange the following carbonions in orde...

Arrange the following carbonions in order of their decreasing stability
`A:H_3C-C-=overset(Theta)C:,B:H-C-=overset(Theta)C:,C:H_3C-overset(Theta)overset(..)(CH_2)`

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Due to greater s-character sp-hybridised carbon is more electronegative than `sp^3` - hybridised carbon and hence can accommodate the -ve charge more effectively. So A and B are more stable than C. Again `-CH_3` group has electron- donating +I effect, therefore it interacts with the -ve charge on carbanion carbon and hence destabilises A relative to B . Thus, stability of the given carbanion decreases in the sequence : `Bgt A gt C`.
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