Out of the compounds below, the vapour pressure of (B) o-nitrophenol at a particular temperature, compared to (A) p-nitrophenol, is

JEE Main Chemistry question

Out of the compounds below, the vapour pressure of -nitrophenol at a particular temperature, compared to -nitrophenol, is

(A)Higher than that of Correct
(B)Lower than that of
(C)Higher or lower than that of , depending on the size of the vessel
(D)Same as that of

Answer: (A)

Solution

-Nitrophenol (B) forms an intramolecular hydrogen bond (chelate ring) between its adjacent –OH and –NO₂ groups, which reduces its ability to associate with other molecules via intermolecular hydrogen bonding. -Nitrophenol (A), with the groups too

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Question ID VK-156135