Consider the following reaction The product '$X$' is used
A
in acid base titration as an indicator
B
in protein estimation as an alternative to ninhydrin
C
in laboratory test for phenols
D
as food grade colourant
JEE MAIN 2020, Difficult
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A
in acid base titration as an indicator
a
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An amine on reaction with benzenesulphonyl chloride produces a compound insoluble in alkaline solution. This amine can be prepared by ammonolysis of ethyl chloride. The correct structure of amine is