Question

Which of the following is true regarding the acidic character?

(a) Aluminium halides acidic character is greater than that of indium halide

(b) Boron halide acidic character is less than that of gallium halide

(c) Gallium halides acidic character is less than that of indium halide

(d) Aluminium halides acidic character is greater than that of boron halide

I got this question in an international level competition.

I would like to ask this question from p-Block Elements in chapter p-Block Elements of Chemistry – Class 11

Answer 1

The correct option is (a) Aluminium halides acidic character is greater than that of indium halide

The explanation: The halides of group 13 elements behave as lewis acids. The correct order of their acidic character decreases from boron, aluminium, gallium and indium. Here halide refers to chlorine, bromine and iodine whereas thallium trichloride can act only as an oxidising agent as it decomposes easily.