Hydrogen bonding is maximum in:

Options

A. Ethanol
B. Diethyl ether
C. Ethyl chloride
D. Triethyl amine

Explanation

To determine which compound exhibits maximum hydrogen bonding among the given options, we will analyze each compound based on the presence of hydrogen atoms attached to highly electronegative atoms (such as oxygen or nitrogen).

### Step-by-Step Solution:

1. **Understanding Hydrogen Bonding**:
- Hydrogen bonding occurs when a hydrogen atom is covalently bonded to a highly electronegative atom (like oxygen, nitrogen, or fluorine) and experiences an attraction to another electronegative atom.

2. **Analyzing Ethanol (C₂H₅OH)**:
- Ethanol contains an -OH (hydroxyl) group. The hydrogen atom in the -OH group is directly bonded to oxygen, which is highly electronegative.
- This allows ethanol to form hydrogen bonds with other ethanol molecules, leading to significant intermolecular attractions.

3. **Analyzing Diethyl Ether (C₂H₅OC₂H₅)**:
- Diethyl ether has an ether functional group (-O-), but there are no hydrogen atoms directly bonded to the oxygen atom.
- Therefore, diethyl ether cannot form hydrogen bonds between its molecules.

4. **Analyzing Ethyl Chloride (C₂H₅Cl)**:
- Ethyl chloride contains a chlorine atom, which is less electronegative than oxygen.
- The hydrogen atoms in ethyl chloride are not bonded to an electronegative atom like oxygen or nitrogen, so it does not exhibit hydrogen bonding.

5. **Analyzing Triethylamine (N(C₂H₅)₃)**:
- Triethylamine contains a nitrogen atom bonded to three ethyl groups. However, the nitrogen is not bonded to any hydrogen atoms.
- As a result, triethylamine cannot form hydrogen bonds.

6. **Conclusion**:
- Among the compounds analyzed, only ethanol has hydrogen atoms bonded to a highly electronegative atom (oxygen) that can participate in hydrogen bonding.
- Therefore, ethanol exhibits the maximum hydrogen bonding compared to diethyl ether, ethyl chloride, and triethylamine.

### Final Answer:
**Ethanol exhibits maximum hydrogen bonding.**