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Standard XII

Chemistry

Formation of Imines

Diazonium sal...

Question

Diazonium salt of which of the following will give coloured dye on reaction with $β - Naphthol$ in acidic medium & NaOH:

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Solution

The correct option is D
Amines on reacting with nitrous acid in acidic condition at $0^{\circ}$ will form diazonium salts which on coupling with $β -$ naphthol gives bright orange coloured dye.
Only aromatic Primary amines will gives Dye test.

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Similar questions

Q. Coupling of benzene diazonium chloride with 1–naphthol in alkaline medium will give:

Q. Of the following statements :

(P) C_{6} H_{5} N = C H - C_{6} H_{5}

is a Schiff's base.

(Q)

A dye is obtained by the reaction of aniline and

C_{6} H_{5} N^{+} \equiv N C l

(R) C_{6} H_{5} C H_{2} N H_{2}

on treatment with

[N a N O_{2} + H C l]

gives diazonium salt.

(S) p -

Toluidine on treatment with

[H N O_{2} + H C l]

gives diazonium salt.

Q.
Statement I: Aniline on reaction with

N a N O_{2} / H C l

0^{o} C

followed by coupling with

β

-naphthol gives a dark blue coloured precipitate.
Statement II: The colour of the compound formed in the reaction of aniline with

N a N O_{2} / H C l

0^{o} C

followed by coupling with

β

-naphthol.

Q. Assertion :Aniline on reaction with

{N a N O}_{2} / H C l

0^{o} C

followed by coupling with

β

naphthol gives a dark blue coloured precipitate. Reason: The colour of the compound formed in the reaction of aniline with

{N a N O}_{2} / H C l

0^{o} C

followed by coupling with

β

naphthol is due to extended conjugation.

Amongst the compound given, the one that would form a brilliant coloured dye on treatment with NaNO₂ in dil.HCL followed by addition to an alkaline solution Of β-naphthol is:

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Diazonium salt of which of the following will give coloured dye on reaction with β−Naphthol in acidic medium & NaOH:

The correct option is D Amines on reacting with nitrous acid in acidic condition at 0∘ will form diazonium salts which on coupling with β−naphthol gives bright orange coloured dye. Only aromatic Primary amines will gives Dye test.

Diazonium salt of which of the following will give coloured dye on reaction with $β - Naphthol$ in acidic medium & NaOH:

The correct option is D
Amines on reacting with nitrous acid in acidic condition at $0^{\circ}$ will form diazonium salts which on coupling with $β -$ naphthol gives bright orange coloured dye.
Only aromatic Primary amines will gives Dye test.