Question

For carbanion,
$\underset{(A)}{R_3}\overline{C}\underset{(B)}{R_2}\overline{C}H\overline{C}\underset{(C)}{H_3}\underset{(D)}{R-\overline{C}{H}_2}$
Stability order will be

• A. $A>B>D>C$
• B. $C>D>B>A$
• C. $B>C>A>D$
• D. $C>B>D>A$

Answer 1

Answer: (B)

As number of alkyl groups increases, $+I$ effect increases which further increases the electron density on carbanion and anion becomes less and less stable. Thus, correct order of stability is :

$\underset{(c)}{\overline{C}{H}_3}>\underset{(D)}{R-\overline{C}{H}_2}>\underset{(B)}{R_2\overline{C}H}>\underset{(A)}{R_3\overline{C}}$