Benzenediazonium chloride on reaction...

Benzenediazonium chloride on reaction with phenol in weakly basic medium gives :

Diphenyl ether

p-hydroxyazobenzene

Chlorobenzene

Benzene

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The correct Answer is:

p-hydroxyazobenzene

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Benzene diazonium chloride on reaction with phenol in weakly basic medium gives

Diazonium salt formation and coupling reaction: When a reaction mixture of phenyl amine and nitrous acid is kept below 10^(@)C , a diazonium salt is formed. This reaction is called diazotization reaction. The diazonium ion, -N_(2)^(+) , is rather unstable and decomposes readily to nitrogen. However, delocalization of the diazonium from pi- bond electron over a benzene ring phenyl diazonium sufficiently for it to form at low temperature. The phenyl diazonium ion behaves as an electrophile, and will attack another arene molecule such as phenol. Electrophilic subsitiution takes at the 4 position, producing 4-hydroxy phenyl azobenzene. The reaction is known as coupling reaction. The compound formed is an energetically stable, yellow azo dye (the azo group is -N=N- ) The stability is due to extensive delocalisation of electrons via the nitrogen- nitrogen double bonds. Benzene diazonium chloride on reaction with phenol in weakly basic medium gives :

Benzenediazonium chloride on reaction with aniline in weakly basic medium gives

Benzene diazonium chloride on reaction with phenol in a basic medium gives:

Benzenediazonium chloride on reaction with water gives

What happens when benzene diazonium chloride reacts with phenol in weak alkaline medium ? (Give balanced equation)

Benzenediazonium chloride is reduced to benzene by

(D) on reaction with phenol under alkaline conditions gives :

Benzene diazonium chloride on reaction with aniline in the presence of dilute hydrochloric acid gives :

ICSE-SAMPLE PAPER 05 (CHEMISTRY)-MULTIPLE CHOICE QUESTIONS

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