Single Choice

Arrange the following in increasing order of covalent character: $$NaCl,\,MgCl_2,\,AlCl_3$$.

A$$NaCl\,<\,MgCl_2\,<\,AlCl_3$$
Correct Answer
B$$MgCl_2\,<\,NaCl\,<\,AlCl_3$$
C$$AlCl_3\,<\,MgCl_2\,<\,NaCl$$
D$$NaCl\,<\,AlCl_3\,<\,MgCl_2$$

Solution

Cation size is decreasing in the order:
$$Ne^+\, >\, Mg^{2+} \,>\, Al^{3+}$$
$$Al^{3+}$$ has maximum polarisation effect and $$Na^+$$ has minimum polarisation effect.
The covalent nature is in the order :
$$AlCl_3\, >\, MgCl_2 \,> \,NaCl$$

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