Assertion :Chlorine reacts more rapidly with $H_{2}$ in comparison to $D_{2}$ . Reason: $D - C l$ bond is stronger in comparison to $H - C l$ bond.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
$H_{2}$ reacts with chlorine much faster than $D_{2}$ because of the isotopic effect. The changes in the properties of isotopes of the elements due to molar mass is called isotopic effect.
$D - C l$ bond is stronger than $H - C l$ bond.

So, Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Hence option B is correct.

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