The ascending order of stability of the carbanion H3 overset-C(P), C6H5 overset-CH2(Q), (CH3)2 overset-CH(R) and H2 overset-C -C H = C H2(S) is

Question

The ascending order of stability of the carbanion H3 overset-C(P), C6H5 overset-CH2(Q), (CH3)2 overset-CH(R) and H2 overset-C -C H = C H2(S) is (A) P < R < S < Q (B) R < P < S < Q (C) R < P < Q < S (D) P < R< Q < S

Tardigrade Admin · Accepted Answer

Stability of carbanions is enhanced by
(i) presence of conjugation
(ii) presence of group exerting -

I

effect. So, the correct order is

(Q) C_{6} H_{5} C - H_{2} > H_{2} C - — (S) C H = C H_{2} > (P) C - H_{3} > (R) (C H_{3})_{2} C - H

Q. The ascending order of stability of the carbanion
$H_{3} C - (P)$ , $C_{6} H_{5} C - H_{2} (Q)$ , $(C H_{3})_{2} C - H (R)$ and $H_{2} C - - C H = C H_{2} (S)$ is

$P < R < S < Q$

$R < P < S < Q$

$R < P < Q < S$

$P < R < Q < S$

Stability of carbanions is enhanced by
(i) presence of conjugation
(ii) presence of group exerting - $I$ effect. So, the correct order is
$(Q) C_{6} H_{5} C - H_{2} > H_{2} C - — (S) C H = C H_{2} > (P) C - H_{3} > (R) (C H_{3})_{2} C - H$

Q. The ascending order of stability of the carbanion H3​C−(P), C6​H5​C−H2​(Q), (CH3​)2​C−H(R) and H2​C−−CH=CH2​(S) is

P<R<S<Q

R<P<S<Q

R<P<Q<S

P<R<Q<S