The following homogeneous gaseous reactions were experimentally found to be second order overall
(i) `2NO_(2) rarr N_(2)+O_(2)`
(ii) `3O_(2)rarr 2O_(3)`
(iii) `N_(2)O_(3) rarr NO + NO_(2)`
(iv) `H_(2) + I_(2) rarr 2HI`
Which of these are most likely to be elementary reaction that occur in one step ?

Options

A. (iii) only
B. (i) and (iii)
C. (i) and (iv)
D. (iii) and (iv)

Answer

C

Explanation

In an elementary reaction, order = molecularity.