Question

Which of the following is in order of increasing covalent characters?

• A. $CC{l}_4<BeC{l}_2<BC{l}_3<LiCl$
• B. $LiCl<CC{l}_4<BeC{l}_2<BC{l}_3$
• C. $LiCl<BeC{l}_2<BC{l}_3<CC{l}_4$
• D. $LiCl<BeC{l}_2<CC{l}_4<BC{l}_3$

Answer 1

The correct option is C $LiCl<BeC{l}_2<BC{l}_3<CC{l}_4$

According to Fajan's rule, as charge on cations increases, their polarising power increases and thus covalent character increases.
Charge on cation increases as follows :
$L{i}^{+}<B{e}^{2+}<B^{3+}<C^{4+}$
So, covalent character increases as:
$LiCl<BeC{l}_2<BC{l}_3<CC{l}_4$