The order of decreasing stability of the carbanions is ( CH 3)3 overset-C (1),( CH 3)2 overset-CH (2), CH 3 overset-C H 2(3), C 6 H 5 overset-C H 2(4)

Question

The order of decreasing stability of the carbanions is ( CH 3)3 overset-C (1),( CH 3)2 overset-CH (2), CH 3 overset-C H 2(3), C 6 H 5 overset-C H 2(4) (A) 1 > 2 > 3 > 4 (B) 4 > 3 > 2 > 1 (C) 1 > 2 > 4 > 3 (D) 4 > 1 > 2 > 3

Tardigrade Admin · Accepted Answer

The stability of the carbanion decreases with increase in number of alkyl groups. However, phenyl group stabilizes the carbanion due to resonance effect.

∴

The order of stability of given ions is as follows

C_{6} H_{5} \overset{ˉ}{C} H_{2} > C H_{3} \overset{ˉ}{C} H_{2} > (C H_{3})_{2} \overset{ˉ}{C} H > (C H_{3})_{3} \overset{ˉ}{C}

or

4 > 3 > 2 > 1

Q. The order of decreasing stability of the carbanions is (CH3​)3​C−(1),(CH3​)2​C−H(2),CH3​C−H2​(3),C6​H5​C−H2​(4)

1 > 2 > 3 > 4

4 > 3 > 2 > 1

1 > 2 > 4 > 3

4 > 1 > 2 > 3

The stability of the carbanion decreases with increase in number of alkyl groups. However, phenyl group stabilizes the carbanion due to resonance effect. ∴ The order of stability of given ions is as follows C6​H5​CˉH2​>CH3​CˉH2​>(CH3​)2​CˉH>(CH3​)3​Cˉ or 4>3>2>1

Q. The order of decreasing stability of the carbanions is
$(C H_{3})_{3} C - (1), (C H_{3})_{2} C - H (2), C H_{3} C - H_{2} (3), C_{6} H_{5} C - H_{2} (4)$