An endergonic reaction has and must be driven without involving any redox change in…

CHEMISTRY · Subjective · A Level · Chemistry · Thermodynamics · Thermodynamics

Problem

An endergonic reaction has ΔG∘=+24 kJ mol−1\Delta G^{\circ}=+24\,\text{kJ\,mol}^{-1} and must be driven without involving any redox change in the driving step. The following potential reactions are available: A. NADH + 12 O2+H+→+\,\tfrac{1}{2}\,\text{O}_2 + \text{H}^+ \rightarrow NAD++H2O^+ + \text{H}_2\text{O}  ΔG∘=−219 kJ mol−1\Delta G^{\circ}=-219\,\text{kJ\,mol}^{-1} B. FADH2+12 O2→_2 + \tfrac{1}{2}\,\text{O}_2 \rightarrow FAD +H2O+ \text{H}_2\text{O}  ΔG∘=−152 kJ mol−1\Delta G^{\circ}=-152\,\text{kJ\,mol}^{-1} C. Acetyl-CoA +H2O→+ \text{H}_2\text{O} \rightarrow acetate +CoA-SH+ \text{CoA-SH}  ΔG∘=−31.4 kJ mol−1\Delta G^{\circ}=-31.4\,\text{kJ\,mol}^{-1} Which reaction should be chosen to couple with the endergonic step so the overall process is spontaneous while satisfying the constraint? Give the letter.

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