Assertion :The molecularity of the reaction, $H_{2} + {B r}_{2} ⟶ 2 H B r$ is $2$ . Reason: The order of this reaction is $3 / 2$ .

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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Assertion is incorrect, but Reason is correct

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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
The given reaction proceeds by a free radical mechanism. It is experimentally obtained that the order is equal to $\frac{3}{2}$ . Also, 2 molecules (1 molecule each of $H_{2}$ and $B r_{2}$ ). react to form the product. Hence, the molecularity is equal to 2.

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(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Reason (R) We cannot determine order from balanced chemical equation.

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