NEET 2007 Chemistry question
The reaction of hydrogen and iodine monochloride is given as:
This reaction is of first order with respect to and , following mechanisms were proposed :
Mechanism A :
Mechanism B : ; slow ; fast
Which of the above mechanism (s) can be consistent with the given information about the reaction
Answer: (2)
Solution
The rate law of a multistep reaction is determined by its slowest (rate-determining) step. Mechanism A is a single elementary step, so its rate law would follow the stoichiometry: , which is second order in ICl and contradicts the observed first order in ICl. In mechanism B
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