Question

Find out the order of stability between $\left(A\right)C{H}_3-\underset{\underset{F}{|}}{C}H-\stackrel{-}{C}H-C{H}_3$ $\left(B\right)\underset{\underset{F}{|}}{C}{H}_2-C{H}_2-\stackrel{-}{C}H-C{H}_3$

• A. A>B
• B. B>A
• C. A=B
• D. Cannot predict

Answer 1

The correct option is A A>B

$-F$ is an electron withdrawing group. Therefore, it will increase the stability of the carbanion. As the distance between the electron withdrawing group $(-F)$ and carbanion increases, the stability of carbanion decreases because -I effect is distance dependent.
Therefore, the order of stability of carbanion is A>B