Discussion
With cyanogen bromide, nicotine gives..................colour.
Answer: A
The reaction gives an orange colour, as the key has it.
Cyanogen bromide is the reagent of the Konig reaction. It opens the pyridine ring of nicotine, and the product couples with an aromatic amine such as aniline to give a yellow to orange colour; the intensity of the yellow colour is used to measure nicotine in tobacco. Orange is the keyed shade and is the closest of the four options to that yellow-orange product. The exact shade named in a standard forensic text could not be confirmed, so the explanation rests on the reaction and on the key.
Blue, green and black are not colours that the Konig reaction of nicotine is known for.
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