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Types of Redox Reactions

Amongst the c...

Question

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:

A

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B

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C

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D

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Solution

The correct option is C

It is a test for - NH₂ group attached on the benzene nucleus following diazotization and coupling reaction.

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Q. Amongst the compounds given, the one that would form a brilliant coloured dye on treatment with

N a N O_{2}

in dil. HCl followed by addition to an alkaline solution of β-naphthol is :

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

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.

Q. In qualitative analysis when

H_{2} S

is passed through an aqueous solution of salt acidified with dil. HCl, a black precipitate is obtained. On boiling the precipitate with dil.

H N O_{3}

it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives._____.

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.

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