Identify the interhalogen compound with which `ClO^(-)` ion is isoelectronic. Does it behave as a Lewis acid?

Explanation

The `ClO^(-)` ion is isoelectronic with the interhalogen compound ClF (each of them has 26 electrons). Due to the presence of vacant d -orbitals in chlorine, the compound acts as a Lewis acid. For example, it accepts electrons from `F^(-)` to form `ClF_(2)^(-)` ion `(F^(-) + ClFtoCIF_(2)^(-))`.