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Treatment of primary amines with nitrous...

Treatment of primary amines with nitrous acid gives diazonium ions. Aliphatic diazonium ions decompose under the diazotization conditions to give complex mixture of products. Aryldiazonium ions are stable and is a valubale intermediate. They react with activated aromatic compounds to give coupling product.
At what pH phenol reacts with benzene diazonium chloride to give coupling product?

A

B

C

D

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The correct Answer is:
A
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Treatment of primary amines with nitrous acid gives diazonium ions. Aliphatic diazonium ions decompose under the diazotization conditions to give complex mixture of products. Aryldiazonium ions are stable and is a valubale intermediate. They react with activated aromatic compounds to give coupling product. What would be the product of the given reaction?

An optically active compound having molecular formula C_(7)H_(15)Br reacts with aqueous KOH to give a racemic mixture of products write the mechanism involved in the reaction.

Knowledge Check

  • p- Toluedine reacts with benzene diazonium chloride to form compound, which on boiling with aq. H_(2)SO_(4) give......products

    A
    3
    B
    2
    C
    4
    D
    5

  • 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. The product which is a red azodye obtained on reacting benzene diazonium chloride with one of the following compounds :

    A
    B
    C
    D

  • 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. The azo dye obtained on reacting 4-aminophenol with nitrous acid (in dilute hydrochloric acid) below 10^(@)C and coupling the resulting diazonium salt with phenol is :

    A
    B
    C
    D

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    An optically active compound having molecular formula C_(7)H_(15)Br reacts with aqueous KOH to give a racemic mixture of products. Write the mechanism involved for this reaction.

    Arenediazonium ion are weak electrophiles, they react with highly reactive aromatic compounds with phenols and tertiary aryl amines to yeild azo compounds. This electrophilic substitution is often called a diazo coupling reaction. What is the major product of given reaction?

    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 :

    Benzene carbaldehyde is reacted with conc. NaOH solution to give the products AB. The product A can be used as a food preservative and the product B is an aromatic hydroxy compound, where -OH group is linked to sp^(3) - hybridised C - atom next to benzene ring. The products A and B respectively are

    A compound of molecular formula C_(3)H_(9)N when reacts with benzene sulphonyl chloride gives a product soluble in dilute NaOH solution. The compound should be

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