Which of the following exists as a liquid at room temperature due to the formation of associated molecules

Options

A. Benzene
B. Water
C. Bromine
D. Carbon disulphide

Explanation

To determine which of the given substances exists as a liquid at room temperature due to the formation of associated molecules, we can analyze each option step by step.

### Step 1: Analyze the Options
The options provided are:
1. Benzene
2. Water
3. Bromine
4. Carbon disulfide

### Step 2: Check Each Substance
- **Benzene**: Benzene is a non-polar aromatic hydrocarbon. It has a melting point of about 5.5°C and a boiling point of approximately 80°C. Although it is a liquid at room temperature, it does not form associated molecules through hydrogen bonding.

- **Water**: Water is a polar molecule that forms hydrogen bonds. Each water molecule can form up to four hydrogen bonds with neighboring water molecules. This extensive hydrogen bonding leads to the formation of associated molecules, allowing water to remain a liquid at room temperature (around 25°C).

- **Bromine**: Bromine is a diatomic molecule (Br2) that exists as a reddish-brown liquid at room temperature. However, it does not form associated molecules through hydrogen bonding and readily evaporates, turning into a gas.

- **Carbon Disulfide**: Carbon disulfide (CS2) is a non-polar molecule that is a liquid at room temperature. However, it does not form associated molecules like water does.

### Step 3: Conclusion
Among the options, water is the only substance that exists as a liquid at room temperature due to the formation of associated molecules through hydrogen bonding.

### Final Answer
The correct answer is **Water**.

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