Question

which of the following compound on diazotization followed by coupling with 2 naphthol will form an azo-dye​

Answer 1

Answer:

Further benzene diazonium chloride reacts with 2-naphthol forms a bright orange colour 2-naphthol aniline dye. Azo compounds are prepared by the reaction of diazonium salts with phenol under alkaline conditions.

Answer 2

p - toluidine on diazotization followed by coupling with 2 naphthol will form an azo-dye.

Explanation

Procedure:

• Test tube 1 : Dissolve aniline into HCl and let it cool in a ice bath to attend temperature near 0°C.
• Test tube 2 : Prepare solution of NaNO2 and also lower it's temperature to 0°C.
• Test tube 3 :Dissolve 2-naphthol in NaOH and let it cool.
• Then mix the 1st and 2nd test tube; the formed mixture contains benzene diazonium chloride.
• Then mix this with the test tube no. 3 to form azo-dye.

Precautions:

The temperature of the solutions must be near 0°C because at higher temperature nitrogen will evolve and diazonium salt will not form.

The complete question is shown here

Which of the following compound on diazotization followed by coupling with 2 naphthol will form an azo-dye? (i. p-toluidine ii. benzylamine iii. N-methylamine?)​

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