Which of the structures does not correspond of the chain isomer of pentane ?

Options

A. `H_2C-CH_2-underset(H)underset(|)overset(CH_3)overset(|)C-CH_2`
B. `H_2C-underset(CH_2)underset(|)overset(CH_3)overset(|)C-CH_3`
C. `H_3C-overset(CH_3)overset(|)"CH"-overset(CH_2)overset(|)"CH"-CH_3`
D. `H_2C-overset(CH_3)overset(|)"CH"-CH_2-CH_3`

Explanation

To determine which structure does not correspond to a chain isomer of pentane, we need to analyze the molecular formula of each option provided. The molecular formula for pentane is C5H12. Chain isomers have the same molecular formula but different structural arrangements.

### Step-by-Step Solution:

1. **Understand the Concept of Isomers**:
- Isomers are compounds that have the same molecular formula but different structural arrangements. Chain isomers specifically differ in the arrangement of the carbon chain.

2. **Identify the Molecular Formula of Pentane**:
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