What is the action of the following reagents on propanone ?
(a) Phenyl hydrazine
(b) Zn-Hg/conc. HCI
(c) Sodium bisulphite.

Explanation

To determine the action of the following reagents on propanone, we will analyze each reagent step by step.

### Step 1: Action of Phenylhydrazine on Propanone
1. **Identify the Reagents**: Phenylhydrazine (C6H5NH-NH2) is a reagent that reacts with carbonyl compounds (like ketones and aldehydes).
2. **Reaction Mechanism**: When phenylhydrazine reacts with propanone (CH3COCH3), it forms a hydrazone through a condensation reaction. In this process, water is eliminated.
3. **Product Formation**: The reaction can be summarized as follows:
\[
\text{CH}_3\text{COCH}_3 + \text{C}_6\text{H}_5\text{NH-NH}_2 \rightarrow \text{CH}_3\text{C}(=NNHC_6H_5)\text{CH}_3 + \text{H}_2\text{O}
...