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Question

Predict all the possible products for the reaction of 2-chlorobutane with alcoholic KOH.


A
1-Butene
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B
Cis-2-butene
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C
Trans-2-butene
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D
2-Butyne
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Solution

The correct option is C Trans-2-butene

The reaction proceeds through E2 elimination mechanism.
https://s3-us-west-2.amazonaws.com/infinitestudent-images/ckeditor_assets/pictures/436417/original_640px-2-Chlorobutane.svg.pngAccording to Saytzeff rule, the more substituted alkenes will be the major product and hence 1-butene will be formed in lesser amount than cis-2-butene and trans-2-butene.


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