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Arrange the given alkyl halides in the o...

Arrange the given alkyl halides in the order of decreasing rate of dehydrohalogenation reaction i.e., when heated in presence of alc. KOH
`CH_(3)-CH_(2)-Cl, CH_(3)-CH_(2)-Br,CH_(3)-CH_(2)-I`

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`CH_(3)-CH_(2)-I > CH_(3)-CH_(2)-Br > CH_(3)-CH_(2)-Cl`
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