Question

The stability of carbanion follows the order

• A. III < IV < I < II
• B. I < II < IV < III
• C. III < II < I < IV
• D. IV < III < II < I

Answer 1

Answer: (C)

Among the given carbanions compound $IV$ has maximum stability as it is resonance stabilised, i.e.

Among the other given carbanions, stability order of carbanion decreases as we move from $1^{\circ }$ to $3^{\circ }$ anion because of $+I$ effect of methyl groups. There is an increased intensity of negative charge on central carbon of $3^{\circ }$ carbanion which further makes it unstable. Thus, the correct increasing order is