Statement A: The photochemical reactions $H_{2} + {Cl}_{2} \to 2 HCl and H_{2} + {Br}_{2} \to 2 HBr$ have equal quantum efficiencies.
Statement B: Both the reactions proceed by different mechanism.

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Both Statement A and Statement B are false

Statement A is false but Statement B is true.

Statement A is true but Statement B is false.

Both Statement A and Statement B are true

answer is D.

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Detailed Solution

$H_{2} + {Cl}_{2} \to 2 HCl$ has much higher quantum efficiency than $H_{2} + {Br}_{2} \to 2 HBr$ .

The first step of secondary process of $H_{2} + {Cl}_{2} \to 2 HCl$ is exothermic while the same for $H_{2} + {Br}_{2} \to 2 HBr$ is endothermic.

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