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Denaturation of alcohol refers to the process of adding which of the following to commercial alcohol so that it becomes unfit for drinking?

1. Adding CuSO4 as the foul-smelling agent and pyridine to impart colour
2. Adding CuSO4 to impart colour and pyridine as the foul-smelling agent
3. Adding Cu(OAc)2 and ammonia to render the alcohol unfit for consumption
4. Adding Cu(OAc)2 and pyridine to render the alcohol unfit for consumption

Correct answer: Adding CuSO4 to impart colour and pyridine as the foul-smelling agent

Solution

Denaturation adds copper sulphate (CuSO4) to impart a blue colour and pyridine to give a foul smell/taste, making the alcohol unfit for drinking.

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