What is the number of structural isomers of monohalogenated n butane?

Explanation

To determine the number of structural isomers of monohalogenated n-butane, we will follow these steps:

### Step 1: Understand the Structure of n-Butane
n-Butane is a straight-chain alkane with the formula C4H10. Its structure can be represented as:
\[ \text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_3 \]

### Step 2: Identify Possible Positions for Halogen Substitution
When we halogenate n-butane (for example, with chlorine), we can place the chlorine atom at different positions along the carbon chain. The carbon atoms in n-butane can be numbered as follows:
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