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Q.

Which one of the following halides is most reactive for S_N2 reaction

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a

${CH}_{3} - CO - {CH}_{2} Br$

b

${CH}_{2} = CH - {CH}_{2} - Br$

c

${CH}_{3} - O - {CH}_{2} Br$

d

$C_{6} H_{5} - {CH}_{2} - Br$

answer is C.

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Detailed Solution

In ${CH}_{3} - CO - {CH}_{2} Br$ , , due to presence of -CO group, C-X bond becomes weak and it facilitates SN² reaction

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