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Q.

The correct order of increasing covalent character is

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a

NaCl<LiCl <BeCl2

b

BeCl2<NaCl<LiCl

c

BeCl2<LiCl<NaCl

d

LiCl<NaCl<BeCl2

answer is A.

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Detailed Solution

Larger the charge on electron (Positive) more is the polarization 
∴more co-valent character with lowest melting point. Due to more effective nuclear charge more hydrated and also due to the presence of vacant orbitals

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