How is phenol prepared from benzene sulphonic acid?

Question

Answer

Answer

Pyrolysis of sodium benzene sulfonate
In this process, benzene sulfonic acid is reacted with aqueous sodium hydroxide. The resulting salt is mixed with solid sodium hydroxide and fused at a high temperature. The product of this reaction is sodium phenoxide, which is acidified with aqueous acid to yield phenol.

Answer

Benzene sulphonic acid is initially treated with an aqueous solution of NaOH. it is then mixed with solid NaOH and fused at high temperature. the resulting product is then acidified to yoeld phenol

Answer

Preparation of Phenol from Benzene Sulphonic Acid
1. Sulphonation of Benzene:
Benzene is first treated with concentrated sulfuric acid at high temperatures to form benzene sulphonic acid. This reaction is known as sulphonation.
2. Hydrolysis of Benzene Sulphonic Acid:
The benzene sulphonic acid is then hydrolyzed using a strong base like sodium hydroxide. This reaction results in the formation of phenol and sodium sulphate.
3. Neutralization Reaction:
The sodium sulphate formed from the hydrolysis is neutralized with an acid to regenerate sulfuric acid for further use in the sulphonation reaction.
4. Isolation of Phenol:
Phenol is then separated from the reaction mixture through processes like distillation or extraction.
5. Purification of Phenol:
The obtained phenol is purified by techniques like recrystallization or distillation to ensure high purity.
By following these steps, phenol can be successfully prepared from benzene sulphonic acid. This process allows for the conversion of benzene into phenol, which has various industrial applications in the production of plastics, pharmaceuticals, and other chemicals.

Similar NEET Doubts

Bakelite is prepared from

Sulphonation of compound A followed by fusion with NaOH gives mixture of o -cresol and p-cresol .Compound A is?? {(1) benzene (2) toulene (3)phenol (4) benzene sulphonic acid.?

How phenol is prepared from chlorobenzene.?

How we make only 4,methyl benzoik acid from benzene ?

The heating of phenyl-methyl ethers with HI produces? A.iodobenze B.phenol C.benzene D.ethyl chlorides?

Top Courses for NEETView all

Biology Class 11

Daily Test for NEET Preparation

NEET Mock Test Series 2025

Topic-wise MCQ Tests for NEET

Physics Class 11

Top Courses for NEET

Top Courses for NEET

Suggested Free Tests

Related Content

About NEET

NEET Preparation Material

How to Prepare for NEET Exam?

NCERT Based Study Material

NEET Mock Tests

Other Popular Exams

Company