Question

The order of decreasing stability of the following carbanions is
(i) `(CH_(3))_(3)C^(-)`
(ii) `(CH_(3))_(2)CH^(-)`
(iii) `CH_(3)CH_(2)^(-)`
(iv) `C_(6)H_(5)CH_(2)^(-)`
A. (i)gt(ii)gt(iii)gt(iv)
B. (iv)gt(iii)gt(ii)gt(i)
C. (iv)gt(i)gt(ii)gt(iii)
D. (iii)gt(ii)gt(i)gt(Iv)

Answer 1

Correct Answer - B
Stability of carbanions decreases with increase in `+I` effect. +I effect is maximum in `(CH_(3))_(3)C^(-)`, followed by `(CH_(3))_(2)CH^(-) and CH_(3)CH_(2)^(-)`. In `C_(6)H_(5)CH_(2)^(-)`, resonance effect increases the stability. Hence, the order of stability is (iv)gt(iii)gt(ii)gt(i)