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JEE · NEET Previous Year Question

$Among the following reactions of hydrogen with halogens, the one that requires a catalyst is:$

Topic: JEE PYQ

Answer: A. Full step-by-step solution below.

A $H_{2} + I_{2} \to 2 HI$
B $H_{2} + Cl_{2} \to 2 HCl$
C $H_{2} + Br_{2} \to 2 HBr$
D $H_{2} + F_{2} \to 2 HF$

Correct answer: A

Solution

(a) The reaction between I_{2} and H_{2} requires catalyst, whereas all other halogens react with H_{2} without the requirement of a catalyst.

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