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when an primay aromatic amine is treated...

when an primay aromatic amine is treated with `NaNO_(2)+HCl` at `0^(0)-5^(0)C`, a diazonium salt is formed and the reaction is called diazo reaction. In this reaction mineral acid must be added to prevent the coupling reaction of diazonium salt with excess of aryl amine. Diazonium salt is highly useful in the synthesis of number of coloured dyes.
For the following diazonium ion the decreasing order of reactivity of these ion in azo-coupling rcaction

A

`Q gt S gt R gt P`

B

`Q gt S gt P gt R`

C

`P gt Q gt R gt S`

D

`S gt R gt Q gt P`

Text Solution

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The correct Answer is:
B
EWG increases reactivity of diazonium salt
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when an primay aromatic amine is treated with NaNO_(2)+HCl at 0^(0)-5^(0)C , a diazonium salt is formed and the reaction is called diazo reaction. In this reaction mineral acid must be added to prevent the coupling reaction of diazonium salt with excess of aryl amine. Diazonium salt is highly useful in the synthesis of number of coloured dyes. In the given reaction

Diazonium salts give coupling reactions with

Knowledge Check

  • when an primay aromatic amine is treated with NaNO_(2)+HCl at 0^(0)-5^(0)C , a diazonium salt is formed and the reaction is called diazo reaction. In this reaction mineral acid must be added to prevent the coupling reaction of diazonium salt with excess of aryl amine. Diazonium salt is highly useful in the synthesis of number of coloured dyes. When 2, 4-dinitroaniline react with NaNO_(2)+HCI at 5^(0)C followed by reaction with anisole, a coloured compound is formed which can be given as

    A
    B
    C
    D

  • Diazonium salts are formed by

    A
    aliphatic primary amines
    B
    aromatic primary amines
    C
    alicyclic primary amines
    D
    heterocycli aromatic nitrogen compounds

  • Aniline when heated with NaNO_(2) and HCl at 0.5^(@)C produces

    A
    Chloro aniline
    B
    Benzene diazonium chloride
    C
    Chlorobenzene
    D
    Dichlorobenzene

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