Which one of the following is the correct statement ?

Options

A. Boric acid is a protonic acid
B. Both `Tl^(3+)` and `Al^(3+)` ions act as oxidising agent in aqueous solution
C. Hydrogen bonding in `H_3BO_3` gives it a layered structure
D. `B(O Et)_3` imparts blue colour to the burner flame

Answer

C

Explanation

(A)It is a weak monobasic Lewis acid. Soluble in water and in aqueous solution the boron atom completes its octet by accepting `OH^-` from water molecules :
`B(OH)_3 + 2H_2O to [B(OH)_4]^(-)+H_3O^(+)`
(B)Only `Ti^(3+)` acts as an oxidsing agent on account of inert pair effect.
(C )In the solid state, the `B(OH)_3` units are hydrogen bonded together into two dimensional sheets with almost hexagonal symmetry.

(D)`B(OEt)_3` imparts green colour to the burner flame.