Discussion
Denatured alcohol with colour and foul smell is made now a days by mixing ethanol with
Answer: C
Denatured alcohol is made by adding CuSO4 and pyridine.
Ethanol for industrial use is made unfit to drink by adding poisonous or unpleasant substances. Copper sulphate gives it a colour, and pyridine a foul smell, so it is easily recognised.
Methanol is also a denaturant (it makes methylated spirit), but it adds neither colour nor smell, which the question specifies. The other pairs are not used for this purpose.
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