question_answer

The indicator that is obtained by coupling the diazonium salt of sulphanilic acid with\[N,N-\]dimethylaniline is:

A)  phenanthroline

B)         methyl orange

C)  methyl red        

D)  phenolphthalein

E)  indigo

Correct Answer: B

Solution :

The reaction of diazotised sulphanilic acid and N, N-dimethyl aniline forms methyl orange as,