A) \[BeC{{l}_{2}}\]
B) \[NaCl\]
C) \[MgC{{l}_{2}}\]
D) \[CaC{{l}_{2}}\]
Correct Answer: A
Solution :
Key Idea If polarisation is very large, the bonding is covalent and if polarisation is small the bonding is ionic. \[BeC{{l}_{2}}\] is covalent chloride due to small atomic size and large charge on \[B{{e}^{2+}}\]. The high charge and small size of the cation will exert greater polarising effect on anions and hence, degree of polarisation increase. While NaCI, \[MgC{{l}_{2}}\] and \[CaC{{l}_{2}}\] are ionic in nature, because in these compound polarisation power is less than \[BeC{{l}_{2}}\] Note - Polarisation power of cation \[\propto \frac{1}{cation\,\,\operatorname{size}}\].
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