Discussion
O-tolidine is 3, 3'dimethyl derivative of
Answer: B
O-tolidine is 3,3'-dimethyl benzidine, so it is the dimethyl derivative of benzidine. Like benzidine it gives a blue colour with hydrogen peroxide in the presence of blood, which makes it useful for the presumptive test for blood.
Phenolphthalein, spelled Phenopthaline in the paper, is the reagent of the Kastle Meyer test and is a different compound. Sodium acetate and sodium chloride are simple salts and have no relation to a dimethyl biphenyl diamine.
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