Give one reason to explain why `ClF_(3)` exists but `FCl_(3)` does not exist?

Explanation

Existance of `ClF_(3)` and `FCl_(3)` can be explained on the basis of size of central atom. Because fluorine is more electronegative as compared to chlorine and has smaller size . Thus , One large `Cl` atom can accommodate three smaller F atoms but reverse is not true.