The type of isomerism observed in alkanes is

Options

A. Metamerism
B. Chain isomerism
C. Position isomerism
D. Geometrical isomerism

Answer

**Step-by-Step Solution:**

1. **Understanding Alkanes**: Alkanes are hydrocarbons that consist solely of single bonds between carbon atoms. Their general formula is CnH2n+2, where n is the number of carbon atoms.

2. **Types of Isomerism**: Isomerism refers to the phenomenon where compounds have the same molecular formula but different structural or spatial arrangements. The main types of isomerism include:
- Structural isomerism
- Geometric isomerism
- Optical isomerism

3. **Identifying Isomerism in Alkanes**:
- **Chain Isomerism**: This occurs when the carbon skeleton can be arranged in different ways, leading to different structural forms. For example, butane (C4H10) can exist as:
- n-butane: CH3-CH2-CH2-CH3
- isobutane (or methylpropane): (CH3)2CH-CH3
- **Position Isomerism**: This type of isomerism involves the position of functional groups or substituents on the carbon chain. However, alkanes do not have functional groups, so position isomerism is not applicable here.
- **Geometric Isomerism**: This type requires the presence of double or triple bonds, which alkanes do not have, so geometric isomerism is also not applicable.

4. **Conclusion**: The only type of isomerism that is observed in alkanes is chain isomerism due to the possibility of branching in their carbon chains.

**Final Answer**: The type of isomerism observed in alkanes is chain isomerism.

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