Question

The reaction of hydrogen and iodine monochloride is given as: $H_2 (g) + 2ICl(g) \longrightarrow 2HCl(g) + I_2 (g)$
The reaction is of first order with respect to H2(g) and ICI(g), following mechanisms were proposed.
Mechanism A: $H_2 (g) + 2ICl(g) \longrightarrow 2HCl(g) + I_2 (g)$
Mechanism B: $H_2 (g) + ICl(g) \longrightarrow HI(g); slow$ $HI (g) + ICl(g) \longrightarrow HCl(g) + I_2 (g); fast$
Which of the above mechanism(s) can be consistent with the given information about the reaction?
(a) A and B both
(b) neither A nor B
(c) A only
(d) B only

Answer 1

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c) A only