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JEE Main 20238 AprilEvening Shift
Exam
JEE Main
Year
2023
Date
8 April
Shift
Evening Shift
Subject
Chemistry
Chapter
Alcohols Phenols and Ethers

JEE Main 2023 · 8 April · Evening Shift · Chemistry · Alcohols Phenols and Ethers

A compound ' X ' when treated with phthalic anhydride in presence...

A compound ′X′' X ' when treated with phthalic anhydride in presence of concentrated H2SO4{H}_{2}{SO}_{4} yields ′Y′' Y '. ′Y′' Y ' is used as an acid/base indicator. ′X′' X ' and ′Y′' Y ' are respectivelyA compound ' X ' when treated with phthalic anhydride in presence of concentrated H _ 2 SO _ 4 yields ' Y ' . ' Y ' is

Options

  1. AAnisole, methyl orange
  2. BSalicylaldehyde, Phenolphthalein
  3. CToludine, Phenolphthalein
  4. DCarbolic acid, Phenolphthalein

Correct answer

D. Carbolic acid, Phenolphthalein

Step-by-step solution

Carbolic acid or phenol reacts with phthalic anhydride in presence of conc. H2SO4{H}_{2}{SO}_{4} 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.

A compound ' X ' when treated with phthalic anhydride in presence of concentrated H _ 2 SO _ 4 yields ' Y ' . ' Y ' is

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

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