The $F - F$ bond is weak because

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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

The ionization energy of the fluorine atom is very low

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

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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