Expand each of the following condensed formulas into their complete structural formulas.
`(a) CH_(3)CH_(2)COCH_(2)CH_(3)`
`(b) CH_(3)CH=CH(CH_(2))_(3)CH_(3)`

Explanation

To expand the given condensed formulas into their complete structural formulas, we will follow a systematic approach for each compound.

### (a) CH₃CH₂COCH₂CH₃

1. **Identify the Carbon Backbone**:
- The condensed formula indicates there are 5 carbon atoms.
- We can represent them as: C1 - C2 - C3 - C4 - C5.

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