$A \rightarrow D$ is an endothermic reaction occurring in three steps (elementary).(i) $A \rightarro

Question

$A ightarrow D$ is an endothermic reaction occurring in three steps (elementary).(i) $A ightarrow B\Delta H_{i} = + ve$(ii) $B ightarrow C\Delta H_{ii} = - ve$(iii) $C ightarrow D\Delta H_{	ext{iii~}} = - ve$Which of the following graphs between potential energy ( y -axis) vs reaction coordinate ( x -axis) correctly represents the reaction profile of $A ightarrow D$ ?

Accepted Answer

Given :$$A ightarrow D;\Delta_{r}H = ( + )ve = E_{D} - E_{A} herefore E_{D} > E_{A} $$Mechanism$${A ightarrow B;\Delta_{r}H = ( + )ve \Rightarrow E_{B} > E_{A} }{B ightarrow C;\Delta_{r}H = ( - )ve \Rightarrow E_{C} < E_{B} }{C ightarrow D;\Delta_{r}H = ( - )ve \Rightarrow E_{D} < E_{C} }$$

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