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Q.

Which of them have highest covalent character?

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a

NaCl

b

MgCl2

c

AlCl3

d

SiCl4

answer is D.

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Detailed Solution

Fajan's rule establishes the covalent nature of a molecule.
According to Fajan's rule, the covalent nature of the molecule rises as the charge density on the cation increases.
The cations of SiCl4,MgCl2,NaCl,KCl are Si+4,Mg+2,Na+,K+ respectively.
So, SiCl4  has the maximum covalent character.
Hence, the option D is correct.

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