With what neutral molecule is `ClO^(-)` isoelectronic ? Is that molecule a Lewis base ?

Explanation

`ClO^(-)` is isoelectronic with `OF_2` and ClF . All three compounds has 26 electrons,
(i) `OF_2` is a very weak Lewis base because of strong electronegativity of fluorine, the non-bonding electron pairs of oxygen will be pulled towards fluorine and is less available for donation,
(ii) `ClF_3` act as `F^(-)` donor. Hence, it act as a Lewis base.
`2ClF + BF_(3) to [Cl_(2)F]^(+) + [BF_(4)]^(-)`