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Question

The major product obtained on treatment of CH3CH2CH(F)CH3 with CH3O−/CH3OH is:

A
CH3CH2CH(OCH3)CH3
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B
CH3CH=CHCH3
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C
CH3CH2CH=CH2
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D
CH3CH2CH2CH2OCH3
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Solution

The correct option is B CH3CH=CHCH3
The major product obtained on treatment of CH3CH2CH(F)CH3 with CH3O/CH3OH is CH3CH=CHCH3 which is saytzeff product.
Note:
Hoffman product is the less substituted alkene and saytzeff product is more substituted alkene.
In most cases, saytzeff product is the major product.
Hoffman product is obtained when the sterically hindered base is used during dehydrohalogenation.

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