Draw the structures of following compound:
i. 3-Methylbutanal
ii. p-Nitropropiopehnone
iii. P-Methylbenzaldehyde
iv. 4-Methylpent-3-en-2-one
v. 4-Chloropentan-2-one
vi. 3-Bromo-4-phenylpentanoic acid
vii. p-p'-Dihydroxybenzophenone
viii. Hex-2-en-4-ynoic acid

Explanation

To draw the structures of the specified compounds, we will go through each one step by step.

### i. 3-Methylbutanal
1. **Identify the longest carbon chain**: The longest chain is butanal, which consists of 4 carbon atoms and an aldehyde group (-CHO) at one end.
2. **Add the methyl group**: The methyl group (–CH₃) is attached to the third carbon of the butanal chain.
3. **Draw the structure**:
```
CH₃
...