Which of the following form micellies in aqueous solution above critical concentration 

Options

A. Glucose
B. Urea
C. Dodecyl trimethyl ammonium chloride
D. Pynidum chloride

Answer

To determine which of the given compounds forms micelles in aqueous solution above the critical micelle concentration (CMC), we need to analyze each option based on their chemical properties.

### Step-by-Step Solution:

1. **Understanding Micelles**:
- Micelles are aggregates of surfactant molecules that form in a solution when the concentration of the surfactant exceeds a certain threshold known as the critical micelle concentration (CMC). Surfactants typically have a hydrophilic (water-attracting) head and a hydrophobic (water-repelling) tail.

2. **Analyzing the Options**:
- **Glucose**:
- Glucose is a simple sugar and does not have the structure necessary to form micelles. It is a hydrophilic molecule and does not have a hydrophobic tail.
- **Urea**:
- Urea is a small organic molecule that is also hydrophilic. It does not possess the amphiphilic nature required to form micelles.
- **Dodecyl Trimethyl Ammonium Chloride**:
- This compound is a quaternary ammonium salt with a long hydrophobic dodecyl tail and a hydrophilic trimethyl ammonium head. It can form micelles in aqueous solutions above its CMC due to its surfactant properties.
- **Pyridinium Chloride**:
- Pyridinium chloride is also a salt, but it does not have a sufficiently long hydrophobic tail to form micelles in the same way as dodecyl trimethyl ammonium chloride.

3. **Conclusion**:
- Among the given options, only **Dodecyl Trimethyl Ammonium Chloride** can form micelles in aqueous solution above the critical concentration.

### Final Answer:
The compound that forms micelles in aqueous solution above critical concentration is **Dodecyl Trimethyl Ammonium Chloride**.

---