The ascending order of stability of the H 3 barC(P), C 6 H 5 barC H 2(Q), ( CH 3)2- CH (R) and H 2 overline C - CH = CH 2( S ) is

Question

The ascending order of stability of the H 3 barC(P), C 6 H 5 barC H 2(Q), ( CH 3)2- CH (R) and H 2 overline C - CH = CH 2( 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

Allyl and benzyl carbanions, due to resonance, are more stable than the primary alkyl carbanion, which is more stable than secondary carbanion as electron releasing group (alkyl group) decreases the stability of carbanions. Between, allyl and benzyl carbanions, benzyl carbanion is more resonance stabilise than the allyl carbanion. Thus, the ascending order of stability is

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

$P < R < S < Q$

$R < P < S < Q$

$R < P < Q < S$

$P < R < Q < S$

Q. The ascending order of stability of the H3​Cˉ(P),C6​H5​CˉH2​(Q), (CH3​)2​−CH(R) and H2​C−CH=CH2​(S) is

P<R<S<Q

R<P<S<Q

R<P<Q<S

P<R<Q<S

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

$P < R < S < Q$

$R < P < S < Q$

$R < P < Q < S$

$P < R < Q < S$