$C H_{3} - C H_{3} | C | C H_{3} - X a l c . K O H - ---- \to$
'X' is halogen
Choose the correct statement for the above reaction is :

β

elimination reaction

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product will be 2-methylpropene

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Dehydrohalogenation reaction

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All of the above.

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Solution

The correct option is D All of the above.
Dehydrohalogenation involves removal of (elimination of) a hydrogen halide by abstracting $β - H$ from a substrate in presence of base (alc. KOH) to form alkenes.
Since, removal of $β$ hydrogen takes place in elimination step thus it's a $β$ elimination reaction.
$C H_{3} - C H_{3} | C | C H_{3} - X a l c . K O H - ---- \to C H_{3} - C | C H_{3} = C H_{2} + H_{2} O + K X$

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