Explain isomerism. State any four characteristics of isomers. Draw the structures of possible isomers of butane, `C_(4)H_(10)`.

Explanation

### Step-by-Step Text Solution

**Step 1: Define Isomerism**
Isomerism is a phenomenon where compounds have the same molecular formula but different structural arrangements. These compounds are known as isomers.

**Step 2: Characteristics of Isomers**
1. **Same Molecular Formula**: Isomers have the same molecular formula but differ in their structural arrangements.
2. **Minimum Carbon Requirement**: Isomerism is possible in hydrocarbons that contain at least four carbon atoms.
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