Home
Class 12
CHEMISTRY
Which of the following compound undergoe...

Which of the following compound undergoes condensation with phthalic anhydride in the presence of hot concentrated `H_(2)SO_(4)` to form phenolphthalein?

A

Resorcinol

B

Phenol

C

Catechol

D

Quinol

Text Solution

Verified by Experts

The correct Answer is:
B
Phenolphthalein is prepared by heating phthalic anhydride (1 molecule) with phenol (2 molecules) in the presence of concentrated sulphuric acid:

It is a white cystalline solid, insoluble in water, but soluble in alkalis to form deep red solution:

In the presence of excess of strong alkali, the solution of phenolphthalein becomes colourless again due to the loss of the quinonoid structure and resonance. Fluorescein is prepared by heating phthlic anhydride (1 molecule) with resorcinol (2 molecules) at `200^(@)C` or at `110-120^(@)C` with anhydrous oxalic acid.
Promotional Banner

Topper's Solved these Questions

  • ALCOHOL, PHENOL AND ETHERS

    R SHARMA|Exercise PHENOLS (IV)|10 Videos

  • ALCOHOL, PHENOL AND ETHERS

    R SHARMA|Exercise ETHERS level I|5 Videos

  • ALCOHOL, PHENOL AND ETHERS

    R SHARMA|Exercise PHENOLS (II)|34 Videos

  • AMINES

    R SHARMA|Exercise Archives|36 Videos

Similar Questions

Explore conceptually related problems

Which of the following compound does undergo aldol condensation

Catechol on heating with phthalic anhydridee in the presence of conc. H_(2)SO_(4) gives :

Which of the following compounds do not undergo aldol condensation?

Phenol when condensed with phthalic anhydride in the presence of conc. H_(2)SO_(4) , yields ,

Which of the following compounds will not undergo aldol condensation ?

Which one of the following phenols does not give colour when condensed with phthalic anhydride in presence of conc. H_2SO_4 ?