1.

Which of the halogens has lowest bond energy?

Answer»

`F_(2)`<BR>`Br_(2)`
`Cl_(2)`
None of these

Solution :The bond energy of F-F bond is least, because of strong inter-electronic repulsions acting between the lone pairs of electrons of the twvo F-atoms. After fluorine, the bond energy increases from `Br_2" to "Cl_2` because increased SIZE RESULTS in less effective OVERLAP of orbitals. Hence, `Cl_2` has highest bond energy.


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