Chemistry · 2026
JEE Main · 24 January 2026, Shift 1 · Q57
A → D is an endothermic reaction occurring in three steps (elementary). (i) A → B Δ H_i=+ ve (ii) B → C Δ H_i i=- ve (iii) C → D Δ H_i i i=- ve Which…
A → D is an endothermic reaction occurring in three steps (elementary).
(i)
$\displaystyle \mathrm{A} \rightarrow \mathrm{B} \Delta \mathrm{H}_i=+\mathrm{ve}$
(ii)
B → C $\displaystyle \Delta \mathrm{H}_{i i}=-\mathrm{ve}$
(iii)
$\displaystyle \mathrm{C} \rightarrow \mathrm{D} \Delta \mathrm{H}_{i i i}=-\mathrm{ve}$
Which of the following graphs between potential energy (y-axis) vs reaction coordinate (x-axis) correctly represents the reaction profile of A → D?
Official answer
From NTA’s final answer key for this paper.
(4)
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JEE Main 2026 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.