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JEE Main201910 Jan 2019Evening ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

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

Options

  1. AH 2 + Cl 2 → 2   HCl
  2. BH 2 + I 2 → 2   HI
  3. CH 2 + F 2 → 2   HF
  4. DH 2 + Br 2 → 2   HBr

Correct answer

B. H 2 + I 2 → 2   HI

Step-by-step solution

I 2 is the least reactive halogen. So, its reaction with H 2 requires a catalyst.

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