Classify the following species into Lewis acid and Lewis base and show how these act as such.
a. `overset(Θ)OH` b. `F^(Θ)` c. `H^(o+)` d. `BCI_(3)`

Explanation

(a) : `OH^(-)` (hydroxyl ion ) is a Lewis base as it can donate an electron pair.
(b) `:underset(..)overset(..)(F):^(-)` is a Lewis base as it has 4 lone pairs of electrons and can donate any one of these.
(c) `H^(+)` is a Lewis base as it can accept electron pair from bases like `OH^(-), F^(-) ` ion etc.
(d) `BCl_(3) ` is a Lewis acid as B is electron deficient (having only 6 electrons instead of complete octet). Hence, it can accept an electron pair from species like ammonia, amines etc.