Q.

The order of reactivity of different halogens towards halogenation of alkanes is:

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a

F2>Cl2>Br2>I2

b

Br2>Cl2>F2>I2

c

I2>Br2>Cl2>F2

d

Cl2>F2>I2>Br2

answer is A.

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Detailed Solution

In halogenation of alkanes, reactivity of halogens decrease with decrease in the electronegativity.In halogenation of alkanes, the mechansim is radical mechanism. As we go from F2 to I2 th energy released in the propogating steps decreases which proves the reactivity order.
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