Which of the following alkyl halide when...

Which of the following alkyl halide when subjected to dehydrohalogenation by the action of ethanolic KOH woulb yield `CH_3CH=C(CH_3)_2` as the major product ?

`CH_3CHBr-CH(CH_3)_2`

`CH_3CH_2CH(CH_3)-CH_2Br`

`CH_3CH_2CHBrCH_2CH_3`

`CH_3CHBrCH_2CH_2CH_3`

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The correct Answer is:

`CH_3-undersetoverset(|)(Br)(C )H -CH(CH_3)_2 overset(alc. KOH)(to) CH_3-CH=C(CH_3)_2`

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