Conversion of propyne to acetone requires three important reagents. Identify which of the following is not one of the three?

Zinc dust

The correct answer is option 2. Zinc dust.

To convert propyne to acetone, the process involves the hydration of propyne to form acetone (CH3COCH3). This reaction typically requires the use of the following reagents:

1. Water \((H_2O)\): Needed for the hydration reaction.

2. Sulfuric acid \((H_2SO_4)\): Acts as a catalyst to facilitate the hydration process.

3. Mercuric sulfate \((HgSO_4)\): Serves as a catalyst in the hydration of alkynes to ketones.

Reaction Mechanism:

The overall reaction for the hydration of propyne \((CH_3C≡CH)\) to acetone \((CH_3COCH_3)\) can be written as:

Zinc Dust:

Zinc dust is not involved in this process. Zinc dust is commonly used as a reducing agent in various reactions, but it does not play a role in the hydration of propyne to acetone.

Conclusion:

The reagent that is not one of the three important reagents for the conversion of propyne to acetone is: Zinc dust.