A D is an endothermic reaction occurring in three steps (elementary). (i) A B Hi = +ve (ii) B C Hii = –ve (iii) C D Hiii = –ve Which of the following graphs between potential energy (y-axis) vs reacti

Question

A D is an endothermic reaction occurring in three steps (elementary). (i) A B Hi = +ve (ii) B C Hii = –ve (iii) C D Hiii = –ve Which of the following graphs between potential energy (y-axis) vs reaction coordinate (x-axis) correctly represents the reaction profile of A D ?

(A) y x
(B) y x
(C) y x
(D) y x ALLEN

Prashant Kotian · Accepted Answer

Correct answer: C. Given : A  D ; rH = (+)ve = ED – EA  ED > EA Mechanism A  B ; rH = (+)ve  EB > EA B  C ; rH = (–)ve  EC < EB C  D ; rH = (–)ve  ED < EC P.E. Reaction co-ordinate X D C B A Y

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