Question

The order of covalent bond character for $LiCl,BeC{l}_2,BC{l}_3$ and $CC{l}_4$ is:

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

Answer 1

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

According to Fajans' rule, more the charge on the cation, more is the covalent character. As the charge on the cation increases from $LiCl$ to $CC{l}_4$, the covalent character also increases in the same manner. Thus, the correct order of increase in the covalent character is:
$LiCl<BeC{l}_2<BC{l}_3<CC{l}_4$