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NEET levelSingle correct optionDifficulty 1 of 3o4169

Among the butyl halides below, which has the best leaving group in E2 elimination?

A $CH X_{3} CH X_{2} CH X_{2} CH X_{2} - F$
B $CH X_{3} CH X_{2} CH X_{2} CH X_{2} - Cl$
C $CH X_{3} CH X_{2} CH X_{2} CH X_{2} - Br$
D $CH X_{3} CH X_{2} CH X_{2} CH X_{2} - I$

Answer: D

Leaving ability follows the weakness of the C-X bond and the stability of

X X^{-}

:

I X^{-} > Br X^{-} > Cl X^{-} > F X^{-}

. So the iodide eliminates fastest.

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