Halogen with highest electron affinity is:

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Solution

The correct option is C Cl
Fluorine, though higher electronegativity than chlorine in the periodic table, has a very small atomic size.

This makes the fluoride anion so formed unstable due to a very high charge/mass ratio.

Also, fluorine has no d electrons which limits its atomic size.

As a result, fluorine has an electron affinity less than that of chlorine.

Option B is correct.

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