Which of the following liquids can conduct electricity in pure state?

Options

A. Water
B. Mercury
C. Bromine
D. Benzene

Explanation

To determine which of the following liquids can conduct electricity in pure state, we need to analyze the properties of each liquid provided in the options.

### Step-by-Step Solution:

1. **Understanding Electrical Conductivity**:
- Electrical conductivity in liquids is primarily due to the presence of ions. When a liquid contains charged particles (ions), it can conduct electricity.

2. **Analyzing Each Option**:
- **Water**: Pure water (distilled water) has very few ions and does not conduct electricity well. It is the impurities in water (like salts) that allow it to conduct electricity.
- **Mercury**: Mercury is a metal and, unlike most liquids, it can conduct electricity in its pure state. Metals are generally good conductors of electricity.
- **Bromine**: Bromine is a non-metallic liquid and does not have free-moving ions in its pure state, so it cannot conduct electricity.
- **Benzene**: Benzene is an organic solvent and does not contain ions in its pure state, thus it cannot conduct electricity.

3. **Conclusion**:
- Among the given options, only **mercury** can conduct electricity in its pure state.

### Final Answer:
The correct option is **mercury**.