CMC Medical CMC-Medical VELLORE Solved Paper-2014

Which of the following statements are correct?

I. Order of a reaction can be known from experimental result and not from the stoichiometry of reaction.

II. Overall molecularity of a reaction may be determined in a manner similar to overall order of reaction.

III. Overall order of reaction,\[{{A}^{m}}+{{B}^{n}}\xrightarrow{{}}A{{B}_{x}}\,\text{is}\,(m+n)\]

IV. Molecularity of a reaction refers to (i) molecularity of each of the elementary steps (slow steps) in a multistep reaction. (ii) molecularity of that particular step in a single step reaction.

Select the correct answer by using the codes given below.

A) I, III and IV

B) I, II and III

C) II, III and IV

D) I, II and IV

Correct Answer: D

Solution :

\[{{A}^{m}}+{{B}^{n}}\xrightarrow{{}}A{{B}_{x}}\] In this case, overall order of reaction may or may not be \[=m+n\] Hence, code 3 is wrong.