• # question_answer The following mechanism has been proposed for the exothermic catalyzed complex reaction $\operatorname{A}+BIAB\xrightarrow{{{k}_{1}}}\operatorname{AB}+I\xrightarrow{{{k}_{2}}}\operatorname{P}+A$ If ${{k}_{1}}$, is much smaller than ${{\operatorname{k}}_{2}}$ the most suitable qualitative plot of potential energy (P. E.) versus reaction co-ordinate (R.C.) for the above reaction A) B) C) D)

 $A+B\operatorname{IAB};$ So ${{E}_{a}}(f)$is high and fast ${{\operatorname{E}}_{a}}$[b] is low.${{k}_{1}}<<{{k}_{2}};$ So, ${{\operatorname{E}}_{a}}$for this step is very high and for next step is low and overall reaction is exothermic.