The correct sequence of increasing melting point of $B e C l_{2}, M g C l_{2}, C a C l_{2}, S r C l_{2}$ and $B a C l_{2}$ is

B a C l_{2} < S r C l_{2} < C a C l_{2} < M g C l_{2} < B e C l_{2}

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B e C l_{2} < M g C l_{2} < C a C l_{2} < S r C l_{2} < B a C l_{2}

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B e C l_{2} < C a C l_{2} < M g C l_{2} < S r C l_{2} < B a C l_{2}

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M g C l_{2} < B e C l_{2} < S r C l_{2} < C a C l_{2} < B a C l_{2}

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Solution

The correct option is B $B e C l_{2} < M g C l_{2} < C a C l_{2} < S r C l_{2} < B a C l_{2}$
Ionic character depends upon, electronegativity difference between cation and anion of the compound. As these difference increases, the ionic character increases. The larger the size of cation and the smaller the size of anion, the more is the electronegativity difference and the more is the ionic character. as here anion is same and sequence of the size of the cation is $B e^{2 +} < M g^{2 +} < C a^{2 +} < S r^{2 +} < B a^{2 +}$

So the correct order of M.P is as follows: $B e C l_{2} < M g C l_{2} < C a C l_{2} < S r C l_{2} < B a C l_{2}$ Hence, option B is correct

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