Question

Polarization is an important phenomenon which is helpful in determination of covalent nature of compound. With the help of Fajan's rule one can easily predict the nature of compound.
The correct increasing covalent nature is:

• A. $NaCl<LiCl<BeC{l}_2$
• B. $BeC{l}_2<NaCl<LiCl$
• C. $BeC{l}_2<LiCl<NaCl$
• D. $LiCl>NaCl>BeC{l}_2$

Answer 1

The correct option is A $NaCl<LiCl<BeC{l}_2$

Betweel $L{i}^{+}$ and $N{a}^{+}$, the former has a greater charge density.
Hence, $LiCl$ is more covalent than $NaCl$.

Likewise, $B{e}^{2+}$ is much more polarizing than $L{i}^{+}$. Thus, the
increasing covalent character is:
$NaCl<LiCl<BeC{l}_2$