ChemistryJEE Main 21 Jan 2026, Shift 1·Q6·MCQ·Moderate

Some Basic Concepts · Eudiometry of hydrocarbon combustion

80 mL of a hydrocarbon on mixing with 264 mL of oxygen in a closed U-tube undergoes complete combustion. The residual gases after cooling to 273 K occupy 224 mL. When the system is treated with KOH solution, the volume decreases to 64 mL. The formula of the hydrocarbon is :

(1) $\ce{C2H4}$
(2) $\ce{C4H10}$
(3) $\ce{C2H2}$
(4) $\ce{C2H6}$

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See the full 21 Jan 2026, Shift 1 paper