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Question

ClCH2CHCl2alc. KOH−−−−−→A
A is:

A
CHCl=CHCl
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B
CH2=CCl2
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C
CHCH
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D
ClCH2CHO
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Solution

The correct option is B CH2=CCl2
Base will abstract the most acidic proton.

In alcoholic solution, elimination is favored. The most acidic hydrogen is removed in the elimination by base. Since it is not a strong base, it can not be further dehydrohalogenated.

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