Give the structures of the compounds which
on reductive ozonolysis give :
(i)propane-1,3-dial
(ii)glyoxal and formaldehyde
(iii)acetaldehyde, formaldehyde and carbon dioxide.

Explanation

To solve the problem, we need to identify the starting compounds that will yield the specified products upon reductive ozonolysis. Let's break it down step by step.

### Step 1: Identify the starting compound for propane-1,3-dial
1. **Target Product**: Propane-1,3-dial (C3H6O2)
2. **Structure of Propane-1,3-dial**:
- The structure is CH2(CHO)CH2(CHO).
3. **Starting Compound**:
- The compound that can yield propane-1,3-dial upon reductive ozonolysis is 1,3-butadiene (CH2=CH-CH=CH2).
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