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JEE Main20238 Apr 2023Evening ShiftChemistryAlcohols Phenols and EthersActual

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

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

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