JEE Main Chemistry question

For which of the following parameters would the structural isomers C₂H₅OH and CH₃OCH₃ be expected to have the same values (assuming ideal behaviour)?

(A)Heat of vaporisation
(B)Vapour pressure at the same temperature
(C)Boiling points
(D)Gaseous densities at the same temperature and pressureCorrect

Answer: (D)

Solution

Under ideal-gas behavior, density = PM/RT depends only on molar mass M (and P, T); since both compounds share molecular formula C₂H₆O (same molar mass), their gas-phase densities are

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Question ID VK-139223