Assertion (A): F – F bond in F₂ molecule is weak
Reason (R): F atom is small in size.

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Both A and R are true and R is the correct explanation of A

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

A is a false but R is true

A is true but R is false

answer is B.

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Detailed Solution

F−F bond in F₂ is weaker than Cl−Cl bond in Cl₂ due to the lower bond energy of F₂, despite shorter bond length is due to repulsion between lone pairs on two F atoms. Down the group, the atomic size decreases. But this does not explain the Assertion.

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