JEE Main · 2024 · 04 Apr 2024 · Shift 2 · General Organic Chemistry

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Correct order of stability of carbanion is

(A) $c > b > d > a$
(B) $a > b > c > d$
(C) $d > a > c > b$
(D) $d > c > b > a$ ✓ Correct

Answer: (D)

Solution

Carbanion (d) has its lone pair delocalised into an aromatic (4n+2

π

-electron) ring system, making it the most stable (aromatic stabilisation). Carbanion (a) is antiaromatic and is therefore the least stable. Between the remaining two sp

^{3}

carbanions, ring/angle-strain considerations make (c) more stable than (b).
Overall order: d > c > b > a.

JEE Main · 2024 · 04 Apr 2024 · Shift 2 · Single correct option

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