What is meant by isomers? Draw the structures of two isomers of butane, `C_(4)H_(10)`. Explain why are cannot have isomers of first three members of alkane series.

Explanation

### Step-by-Step Solution:

1. **Definition of Isomers**:
Isomers are compounds that have the same molecular formula but different structural formulas. This means that they contain the same number of atoms of each element, but the arrangement of these atoms differs, leading to different properties.

2. **Identifying Isomers of Butane**:
Butane has the molecular formula \(C_4H_{10}\). There are two structural isomers of butane:
- **n-Butane**: This is the straight-chain form of butane. Its structure can be represented as:
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