Question

The halides of group IIIA elements behave as lewis acids. The acceptor ability is maximum for halides of :

• A. $Tl$
• B. $Ga$
• C. $Al$
• D. $B$

Answer 1

The correct option is D $B$

Option $\left(D\right)$ is correct.

The acceptor ability is maximum for halides of boron due to the availability of 3 valence electrons ($2s^{2}2p^1$) for covalent bond formation using four orbitals ($2s,2p_x,2p_y$and $2p_z$) leads to electron deficiency in boron compounds. This deficiency makes them good electron acceptor and thus boron compounds behave as lewis acids.