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Question

Find out the order of stability between (A) CH3−C|FH−−CH−CH3 (B) C|FH2−CH2−−CH−CH3

A
A>B
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B
B>A
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C
A=B
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D
Cannot predict
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Solution

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

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