Write IUPAC and common names for the following :
` (a) (CH_3)_3 C C HO`
`(b) HOCH_2 CH_2 CHO`
`(c ) H_2 C= CH COCH_3`

Explanation

To solve the problem of writing IUPAC and common names for the given compounds, we will follow these steps:

### Step 1: Analyze the first compound (CH₃)₃CCHO

1. **Identify the structure**: The compound is a branched aldehyde with a total of 5 carbon atoms.
2. **Determine the parent chain**: The longest carbon chain containing the aldehyde functional group is 3 carbons long, which is propanal.
3. **Identify substituents**: There are two methyl groups attached to the second carbon of the parent chain.
4. **Write the IUPAC name**: The IUPAC name is 2,2-dimethylpropanal.
...