Arrange the following halogens in decreasing order of reactivity with alkynes.

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

Halogenation of alkynes takes place as:

Fluorination is an explosive reaction. Chlorination takes place faster than bromination. In case of iodination, second step does not take place. Hence the order or reactivity is: $F_{2} > C l_{2} > B r_{2} > I_{2}$

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