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In the following, statement of Assertion (A) is followed by a statement of reason (R). Mark the correct choice.
Assertion (A ): $F_{2}$ has lower bond dissociation energy than $C l_{2}$
Reason (R ): Flourine is more electronegative than chlorine

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Bothe A and R are true and ‘R’ is the correct explanation of ‘A’

Both A and R are true but R is not the correct explanation of A

A is true But R is false

A is false and R is true

answer is B.

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Detailed Solution

Bond dissociation enthalpy of $F_{2}$ is lower than $C l_{2}$ due to small size of fluorine and relatively larger electron –electron repulsion among the lone pairs $F_{2}$ molecule where they much closer to each other than in case of $C l_{2}$ .

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