Question

Which one of the following reactions does NOT give benzene as the product?

Options

• 

• 

• \[\ce{H - C ≡ C - H ->[red hot iron tube][at 873 K]}\]

• 

Answer 1

Explanation:

Sodium Benzoate + Sodalime: This is a decarboxylation reaction. Heating sodium benzoate with sodalime removes the carboxyl group to produce benzene.

n-hexane + Mo₂O₃(773 K, 10-20 atm.): This is catalytic reforming (aromatization). n-hexane undergoes cyclization and dehydrogenation to form benzene.

Ethyne + Red hot iron tube (873 K): This is the cyclic trimerization of ethyne (acetylene). Three molecules of ethyne combine to form benzene.

Benzene Diazonium Chloride + H₂O (warm): When benzene diazonium chloride is warmed with water, it undergoes hydrolysis to produce phenol (C₆H₅OH), nitrogen gas, and HCl.