Which of the following set can be used for the denaturation of ethyl alcohol ?

Question

Accepted Answer

Option 3 is the correct choice for the denaturation of ethyl alcohol because it includes methanol, pyridine, and copper sulphate, which are commonly used denaturants. Here's why each component in Option 3 is suitable for this purpose:

1. **Methanol**: Methanol is a common denaturant for ethyl alcohol. It is toxic and makes the alcohol unfit for consumption. Its addition ensures that the ethyl alcohol cannot be used for drinking purposes, which is the primary goal of denaturation.

2. **Pyridine**: Pyridine is another effective denaturant. It has a strong, unpleasant odor and taste, which further discourages consumption. Its chemical properties make it an excellent choice for altering the sensory characteristics of ethyl alcohol.

3. **Copper Sulphate**: Copper sulphate is used to impart a distinct color to the alcohol, making it visually identifiable as denatured. This visual cue is important for preventing accidental ingestion.

Now, let's examine why the other options are incorrect:

1. **Option 1 (Methanol, Water, Copper Chloride)**: While methanol is a suitable denaturant, water and copper chloride are not typically used for denaturing alcohol. Water dilutes the alcohol but does not render it undrinkable, and copper chloride does not have the necessary properties to effectively denature alcohol.

2. **Option 2 (Propanol, Vinegar, Potassium Permanganate)**: Propanol is not commonly used as a denaturant for ethyl alcohol. Vinegar, being acetic acid, does not effectively denature alcohol, and potassium permanganate is not suitable for this purpose due to its oxidizing properties, which could lead to unwanted chemical reactions.

3. **Option 4 (Vinegar, Pyridine, Water)**: While pyridine is a suitable denaturant, vinegar and water are not effective for denaturing alcohol. Vinegar does not have the necessary toxic or sensory-altering properties, and water merely dilutes the alcohol without denaturing it.

In conclusion, Option 3 is the correct choice because it includes methanol, pyridine, and copper sulphate, all of which are effective denaturants that alter the chemical, sensory, and visual properties of ethyl alcohol, making it unfit for consumption.