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Q.

The correct order of bond dissociation enthalpy of halogens is

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a

CI2>F2>Br2>I2

b

I2>Br2>Cl2>F2

c

Cl2>Br2>F2>I2

d

F2>Cl2>Br2>I2

answer is C.

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Detailed Solution

Correct order of bond dissociation enthalpy of halogens is ${Cl}_{2} > {Br}_{2} > F_{2} > I_{2}$

Due to inter electronic repulsions $F - F$ bond becomes, weak and easily broken.

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The correct order of bond dissociation enthalpy of halogens is