Ether which is lipuid at room temperature is :

Options

A. `C_(2) H_(5) OCH_(3)`
B. `CH_(3) OCH_(3)`
C. `C_(2) H_(5) OC_(2) H_(5)`
D. None of these

Answer

To determine which ether is liquid at room temperature, we can analyze the given options based on their physical states and boiling points.

### Step-by-Step Solution:

1. **Identify the Options**: The question provides several ethers as options. We need to evaluate each one to see if it is liquid at room temperature.

2. **Check Ethyl Methyl Ether**:
- **Boiling Point**: Ethyl methyl ether has a boiling point of 7.6 °C.
- **State at Room Temperature**: Since room temperature is typically around 25 °C, ethyl methyl ether will be in a gaseous state at this temperature.

3. **Check Dimethyl Ether**:
- **Boiling Point**: Dimethyl ether has a boiling point of -24 °C.
- **State at Room Temperature**: Given that -24 °C is well below room temperature, dimethyl ether will also be a gas at room temperature.

4. **Check Diethyl Ether**:
- **Boiling Point**: Diethyl ether has a boiling point of 34.6 °C.
- **State at Room Temperature**: Since 34.6 °C is above room temperature, diethyl ether will be a liquid at room temperature.

5. **Conclusion**: Based on the boiling points and states at room temperature, the only ether that is liquid at room temperature is diethyl ether.

### Final Answer:
The ether which is liquid at room temperature is **Diethyl Ether**.

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