Question

Which of the following compounds has the maximum covalent character?

• A. $NaCl$
• B. $SiC{l}_4$
• C. $AlC{l}_3$
• D. $MgC{l}_2$

Answer 1

The correct option is B $SiC{l}_4$

When the anion is the same in a given set of compounds (or) molecules, polarization in a molecule increases with increase in charge and decrease in size of the cation.
Since the anion is common in all which is $Cl$, it is the cation which will be the governing factor. As per Fajan's rule, more the charge on the cation, more will be its polarizing power and hence more will be covalent character of the molecule. Among the four, $SiC{l}_4$ has the maximum charge of $+4$. Hence, $SiC{l}_4$ will have maximum covalent character.