24. The carbanion which is most stable is
(2) CH2 = CH-CH2
Y HC = 8
CH3
(4) CH3 - ©
CHE
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In this case CH3-CH2+ is more stable than CH2=CH+. First I'll explain about CH3-CH2+ carbocation. The positive charge on the CH2 is stabilised by the inductive effect from the neighbouring carbon atom.
Coming to CH2=CH+. The two carbon atoms involved are sp2 hybridised. An sp2 hybridised atom is averse to a positive charge and this aversion increases as the s-character of a hybridised carbon atom increases. Also the inductive effect decreases by the neighbouring carbon atom because that is also sp2 hybridised.
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