Question

Boric acid is:

• A. Monobasic and weak lewis acid
• B. Monobasic and weak bronsted acid
• C. Monobasic and strong lewis acid
• D. Tribasic and strong bronsted acid

Answer 1

The correct option is A Monobasic and weak lewis acid

Boric acid is monobasic acid and weak lewis acid.
Boric acid contains 3 -OH groups yet it acts as monobasic acid rather than tribasic acid because boric acid does not act as proton donor but it accepts a lone pair of electron from $O{H}^{-}$ ions and forms $B(OH{)}_4^{-}$. Boric acid behaves as lewis acid because it accepts a lone pair of electron from $O{H}^{-}$.

Boric acid considered as weak acid because it does not associate to produce ions rather forms metaborate ion.
Hence correct option is a.