JEE Main 2023ChemistryAlcohols Phenols and EthersHardMCQ

JEE Main 2023 — Alcohols Phenols and Ethers Question with Solution

JEE Main 2023 (08 Apr Shift 2)

Question

A compound 'X' when treated with phthalic anhydride in presence of concentrated H2SO4 yields 'Y'. 'Y' is used as an acid/base indicator. 'X' and 'Y' are respectively

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Show full solutionCorrect option: D
Correct answer
DCarbolic acid, Phenolphthalein

Step-by-step explanation

Carbolic acid or phenol reacts with phthalic anhydride in presence of conc. H2SO4 to form phenolphthalein which is used as an acid base indicator. The type of reaction involved is electrophilic substitution reaction. Phenol is ortho-para directing group. Hence, substitution occurs at para position.

The phenolphthalein is colourless below pH 8.5 and attains a pink to deep red hue above pH 9.0.

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About this question

This is a previous-year question from JEE Main 2023, covering the Alcohols Phenols and Ethers chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.