Geo-Scientist Prelims 2026 Chemistry Q62: At 300 K, Z-2-butene isomerises to E-2-butene with ΔG°ᵣ = −3·44 kJ…

At 300 K, Z-2-butene isomerises to E-2-butene with ΔG°ᵣ = −3·44 kJ mol⁻¹ A catalyst for isomerisation is added to a vessel that is kept at 300 K along with a small amount of Z-2-butene. The mole fraction of E-2-butene in the vessel when equilibrium is reached is : (Given : R = 8·31 J K⁻¹ mol⁻¹ and ln 2 = 0·69)

1. (a) 0·23
2. (b) 0·34
3. (c) 0·56
4. (d) 0·80