The F-F bond is weak because

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The repulsion between the non bonding pairs of electrons of two fluorine atoms is large

The ionization energy of the fluorine atom is very low

The bond length of F-F bond is much larger than the bond length in other halogen molecules.

The F-F bond distance is small and hence the inter nuclear repulsion between the two ‘F’ atoms is very low

answer is A.

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Detailed Solution

Due to the small size of fluorine atoms the repulsions between the lone pairs of adjacent fluorine atoms is maximum;Thus F-F bond is weak ;

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