Arrange the halogens F2, Cl2, Br2, I2 in order of their increasing reactivity with alkanes

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Arrange the halogens $F_{2}, {Cl}_{2}, {Br}_{2}, I_{2}$ in order of their increasing reactivity with alkanes

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Br2

answer is A.

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Detailed Solution

Reaction of F₂ is so fast with alkanes that the heat produced in the reaction causes explosion. The reaction of I₂ with alkane is reversible in nature and requires some oxidising agent like HgO, HIO₃ etc., to consume the HI produced and forward reaction is carried out.

${CH}_{4} + I_{2} ⇌ {CH}_{3} I + HI$