Which of the following is not responsible for stability of acyclic hydrocarbon.

Options

A. Steric interactions
B. Torsional strain
C. Electrostatic forces of interaction
D. angle strain

Answer

To determine which of the following is not responsible for the stability of acyclic hydrocarbons, we need to analyze the factors that contribute to the stability of these compounds.

### Step-by-Step Solution:

1. **Understanding Acyclic Hydrocarbons**:
- Acyclic hydrocarbons are compounds that do not form a ring structure. They can be straight-chain or branched. An example is propane (CH3CH2CH3).

2. **Identifying Stability Factors**:
- The stability of acyclic hydrocarbons can be influenced by several factors:
- **Steric Interactions**: These occur when atoms are forced into close proximity, leading to repulsion. More branching can increase steric hindrance, potentially decreasing stability.
- **Torsional Strain**: This arises from eclipsing conformations in the molecule. For example, in butane, torsional strain can be observed when looking at its Newman projection.
- **Electrostatic Forces of Interaction**: These are present due to the differences in electronegativity between carbon and hydrogen, contributing to the overall stability.
- **Angle Strain**: This is the strain that occurs when bond angles deviate from the ideal values. Angle strain is typically associated with cyclic compounds due to their fixed bond angles.

3. **Analyzing the Options**:
- **Option A: Steric Interaction** - Responsible for stability but can also decrease it with increased branching.
- **Option B: Torsional Strain** - Present in acyclic hydrocarbons and affects stability.
- **Option C: Electrostatic Forces of Interaction** - These forces do contribute to the stability of acyclic hydrocarbons.
- **Option D: Angle Strain** - This is not relevant for acyclic hydrocarbons as they do not have fixed angles like cyclic hydrocarbons do.

4. **Conclusion**:
- The factor that is **not responsible** for the stability of acyclic hydrocarbons is **Angle Strain** (Option D).

### Final Answer:
**Option D: Angle Strain** is not responsible for the stability of acyclic hydrocarbons.

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