Question:

When phenol reacts with phthalic anhydride in presence of $H _{2} SO _{4}$ and heated and hot reaction mixture is poured in $NaOH$ solution, then product formed is

Updated On: Aug 1, 2022
  • alizarin
  • methyl orange
  • fluorescein
  • phenolphthalein
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The Correct Option is D

Solution and Explanation

Phenol couples with phthalic anhydride in presence of cone. HSO to form phenolphthalein which is used as an indicator :
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Concepts Used:

Alcohols, Phenols, and Ethers

Alcohol is formed when a saturated carbon atom bonds to a hydroxyl (-OH) group. It is an organic compound that contains a hydroxyl functional group attached to a carbon atom.

Phenol is formed when the -OH group replaces the hydrogen atom in benzene. It is an organic compound in which a hydroxyl group directly attaches to an aromatic hydrocarbon.

Ether is formed when oxygen atom bonds to two alkyl or aryl groups. It is an organic compound that has an oxygen atom that is connected to two aryl and alkyl groups.

Read More: Alcohol, Phenol, and Ethers