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Methy1 orange an acid-base indicator is prepared by diazo coupling reaction of `N,N` dimethylaniline with

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Methy1 orange an acid-base indicator is prepared by diazo coupling reaction of `N,N` dimethylaniline with
A. sulphanilic acid
B. orthanilic acid
C. metanilic acid
D. picric acid
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Correct Answer - A
At`pH gt 4.4(A)` exits as the yellow coloured free base (as it absorbs violet light) `At pH lt 3` it is red (due to absorption of green) due to formatin of (B) through protonation of a azo N and subsequent delocalization
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