Assertion : $B e C l_{2}$ exist as dimer below 1200K and monomer above 1200K. Reason: $B e C l_{2}$ is in dimeric form in vapour phase below 1200K.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
$B e C l_{2}$ exist as dimer below 1200K and monomer above 1200K and monomer exists in vapour phase as in solid phase it polymerized.
Structure of $B e C l_{2}$ is polymer is similar to to Be hydride polymer but bonding id different. Both show clustring and halide have halogen bridges.

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