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Bromine Water Test

In addition t...

Question

In addition to $2 -$ butene, the most reactive halogen is:

F_{2}

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C l_{2}

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B r_{2}

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I_{2}

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Solution

The correct option is B $C l_{2}$
$C l_{2}$ molecule forms $C l^{+}$ . $C l^{+}$ electrophile easily reacts with 2-butene to form 2,3-di chloro butane.

$C H_{3} C H = C H C H_{3} + C l_{2} \to C H_{3} C H C l C H C l C H_{3}$

So answer is B.

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F_{2} > C l_{2} > B r_{2} > I_{2}

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