Question

The sequence of the polarizability of ${\text{I}}^{-},{\text{Br}}^{-},{\text{Cl}}^{-}$ and ${\text{F}}^{-}$ ions is

• A. $I^{-}>B{r}^{-}>C{l}^{-}>F^{-}$
• B. $I^{-}>B{r}^{-}=C{l}^{-}>F^{-}$
• C. $I^{-}=B{r}^{-}=C{l}^{-}>F^{-}$
• D. $I^{-}=B{r}^{-}<C{l}^{-}=F^{-}$

Answer 1

Answer: (A)

Applying Fajan's rules:

Larger the anion, more the polarization of electron density towards cation.

$I^{-}>B{r}^{-}>C{l}^{-}>F^{-}$