Question

Polarisibility of halide ions increases in the order
(a) F⁻, I⁻, Br⁻, Cl⁻
(b) Cl⁻, Br⁻, I⁻, F⁻
(c) I⁻, Br⁻, Cl⁻, F⁻
(d) F⁻, Cl⁻, Br⁻, l⁻

Answer 1

(d) F- < Cl- < Br- < I-

because polarizability is directly proportional to the size of the anion larger is the size of the anion larger is the polarizability and vice versa. As I- has the maximum size , polarizability is maximum.