The order of decreasing stability of the following carbanions is (i) (CH3)3 C- (ii) (CH3)2CH- (iii) CH3CH-2 (iv) C6H5CH-2

Question

The order of decreasing stability of the following carbanions is (i) (CH3)3 C- (ii) (CH3)2CH- (iii) CH3CH-2 (iv) C6H5CH-2 (A) (i) > (ii) > (iii) > (iv) (B) (iv) > (iii) > (ii) > (i) (C) (iv) > (i) > (ii) > (iii) (D) (iii) > (ii) > (i) > (iv)

Tardigrade Admin · Accepted Answer

Stability of carbanions decreases with increase in

+ I

effect.

+ I

effect is maximum in

(C H_{3})_{3} C^{-}

, followed by

(C H_{3})_{2} C H^{-}

and

C H_{3} C H_{2}^{-}

. In

C_{6} H_{5} C H_{2}^{-}

, resonance effect increases the stability. Hence, the order of stability is

(i v) > (iii) > (ii) > (i)

.

Q. The order of decreasing stability of the following carbanions is
(i) $(C H_{3})_{3} C^{-}$
(ii) $(C H_{3})_{2} C H^{-}$
(iii) $C H_{3} C H_{2}^{-}$
(iv) $C_{6} H_{5} C H_{2}^{-}$

$(i) > (ii) > (iii) > (i v)$

$(i v) > (iii) > (ii) > (i)$

$(i v) > (i) > (ii) > (iii)$

$(iii) > (ii) > (i) > (i v)$

Q. The order of decreasing stability of the following carbanions is (i) (CH3​)3​C− (ii) (CH3​)2​CH− (iii) CH3​CH2−​ (iv) C6​H5​CH2−​

(i)>(ii)>(iii)>(iv)

(iv)>(iii)>(ii)>(i)

(iv)>(i)>(ii)>(iii)

(iii)>(ii)>(i)>(iv)

Stability of carbanions decreases with increase in +I effect. +I effect is maximum in (CH3​)3​C−, followed by (CH3​)2​CH− and CH3​CH2−​. In C6​H5​CH2−​, resonance effect increases the stability. Hence, the order of stability is (iv)>(iii)>(ii)>(i).

Q. The order of decreasing stability of the following carbanions is
(i) $(C H_{3})_{3} C^{-}$
(ii) $(C H_{3})_{2} C H^{-}$
(iii) $C H_{3} C H_{2}^{-}$
(iv) $C_{6} H_{5} C H_{2}^{-}$

$(i) > (ii) > (iii) > (i v)$

$(i v) > (iii) > (ii) > (i)$

$(i v) > (i) > (ii) > (iii)$

$(iii) > (ii) > (i) > (i v)$