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Ethene on treating with Br(2) in presenc...

Ethene on treating with `Br_(2)` in presence of sodium chloride forms a mixture of `CH_(2)ClCH_(2)Br` and `CH_(2)BrCH_(2)Br`. Give reason.

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The addition of `Br_(2)` follows ionic mechanism. The intermediate carbocation formed is attacked by `Br^(-)` as well as `Cl^(-)` give by NaCl.
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