Out of the following, which one has least value of melting point?

L i C l

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B e C l_{2}

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M g C l_{2}

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C a C l_{2}

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Solution

The correct option is B $B e C l_{2}$
From Fajan's rules we know that $B e^{2 +}$ has the most polarising power and therefore, $B e C l_{2}$ is the most covalent among the given compounds and hence will have the least boiling point.

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