The correct order of increasing covalent character of the following is

Options

A. `SiCl_(4) lt AlCl_(3) lt CaCl_(2) lt KCl`
B. `KCl lt CaCl_(2) lt AlCl_(3) lt SiCl_(4)`
C. `Al Cl_(3) lt CaCl_(2) lt KCl lt SiCl_(4)`
D. None of the above

Answer

B

Explanation

En differene in `SiCl_(4)=3.0-1.8=1.2`
in `AlCl_(3)=3.0-1.5=1.5`
in `CaCl_(2)=3.0-1.0=2.0` and
in `KCl=3.0-0.8=2.2`
`:. KCl lt CaCl_(2) lt AlCl_(3) lt SiCl_(4)`
This order is also obtained by applying fajans rule.
i.e., caovalent character `prop` charge on ion.