A substance which forms micelles the solution contains

Options

A. carboxylic group
B. alkyl groups
C. water insoluble long hydrocarbon groups and water soluble polar group.
D. water soluble hydrocarbon group and water insoluble polar group

Answer

To solve the question "A substance which forms micelles in solution contains?", we need to analyze the characteristics of micelles and the components that contribute to their formation.

### Step-by-Step Solution:

1. **Understanding Micelles**:
- Micelles are formed by amphiphilic molecules, which have both hydrophobic (water-repelling) and hydrophilic (water-attracting) parts.

2. **Identifying Hydrophobic and Hydrophilic Components**:
- The hydrophobic part is typically a long hydrocarbon chain that does not mix with water.
- The hydrophilic part is usually a polar group that interacts favorably with water.

3. **Analyzing the Options**:
- **Option A**: Carboxylic group - This is a polar group, but it does not represent the hydrophobic part needed for micelle formation.
- **Option B**: Alkyl group - This is a hydrophobic group, but it lacks a polar part to attract water.
- **Option C**: Water insoluble long hydrocarbon group and water soluble polar group - This option correctly describes the two components necessary for micelle formation: a hydrophobic part (the long hydrocarbon) and a hydrophilic part (the polar group).
- **Option D**: Water soluble hydrocarbon group and water insoluble polar group - This is incorrect because a water-soluble hydrocarbon does not contribute to micelle formation.

4. **Conclusion**:
- The correct answer is **Option C**: Water insoluble long hydrocarbon group and water soluble polar group. This combination allows the substance to form micelles in solution.