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Polarisability and Fajan's Rule

The order of ...

Question

The order of covalent bond character for $L i C l, B e C l_{2}, B C l_{3}$ and $C C l_{4}$ is:

A

L i C l > B e C l_{2} > B C l_{3} > C C l_{4}

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B

L i C l < B e C l_{2} < B C l_{3} < C C l_{4}

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C

L i C l > B e C l_{2} > C C l_{4} > B C l_{3}

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D

B e C l_{2} > L i C l > B C l_{3} > C C l_{4}

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Solution

The correct option is B $L i C l < B e C l_{2} < B C l_{3} < C C l_{4}$
According to Fajans' rule, more the charge on the cation, more is the covalent character. As the charge on the cation increases from $L i C l$ to $C C l_{4}$ , the covalent character also increases in the same manner. Thus, the correct order of increase in the covalent character is:
$L i C l < B e C l_{2} < B C l_{3} < C C l_{4}$

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