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Question
Number of carbanions which are more stable than ⊖CH2−CH3
(i) ⊖CH3 (ii) ⊖CF3 (iii) ⊖CH(CH3)2 (iv) ⊖CCl3 (v) ⊖CH2−CCl3 (vi) ⊖CH2−CH2−CH3
(vii) ⊖CH2−⊕N(CH3)3 (viii) ⊖C(CH3)3 (ix) ⊖CH2−CD3 :
Number of carbanions which are more stable than ⊖CH2−CH3
(i) ⊖CH3 (ii) ⊖CF3 (iii) ⊖CH(CH3)2 (iv) ⊖CCl3 (v) ⊖CH2−CCl3 (vi) ⊖CH2−CH2−CH3
(vii) ⊖CH2−⊕N(CH3)3 (viii) ⊖C(CH3)3 (ix) ⊖CH2−CD3 :
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Solution
The correct option is D 5
Alkyl groups, a +I group, destabilise carbanions by releasing more electron density while the higher electron negative groups like halogens have −I effect which withdraws the electron density and stabilizes the negative charge of carbanion. The anions which are more stable than CH3−CH2− are I, II, IV, V & VII.
Hence, the correct option is D
Alkyl groups, a +I group, destabilise carbanions by releasing more electron density while the higher electron negative groups like halogens have −I effect which withdraws the electron density and stabilizes the negative charge of carbanion. The anions which are more stable than CH3−CH2− are I, II, IV, V & VII.
Hence, the correct option is D
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