Intermolecular hydrogen bonds are not present in ?

Options

A. `CH_(3)COOH`
B. `C_(2)H_(5)NH_(2)`
C. `CH_(3)CH_(2)OH`
D. `CH_(3)OCH_(3)`

Answer

To determine which compound does not exhibit intermolecular hydrogen bonding, we need to analyze the options provided:

1. **Understanding Intermolecular Hydrogen Bonds**:
Intermolecular hydrogen bonds occur between molecules when a hydrogen atom covalently bonded to a highly electronegative atom (like oxygen, nitrogen, or fluorine) interacts with another electronegative atom in a neighboring molecule.

2. **Analyzing Each Option**:
- **Option A: CH3COOH (Acetic Acid)**:
- Acetic acid has a hydroxyl group (-OH) which can participate in hydrogen bonding. The hydrogen atom of the -OH group can form a hydrogen bond with the oxygen of another acetic acid molecule.
- **Conclusion**: Intermolecular hydrogen bonding is present.

- **Option B: C2H5NH2 (Ethylamine)**:
- Ethylamine contains an amine group (-NH2). The hydrogen atoms in the amine can also form hydrogen bonds with the nitrogen of another ethylamine molecule.
- **Conclusion**: Intermolecular hydrogen bonding is present.

- **Option C: CH3CH2OH (Ethanol)**:
- Ethanol has a hydroxyl group (-OH) similar to acetic acid. The hydrogen from the -OH can form hydrogen bonds with the oxygen of another ethanol molecule.
- **Conclusion**: Intermolecular hydrogen bonding is present.

- **Option D: CH3OCH3 (Dimethyl Ether)**:
- Dimethyl ether is an ether and does not have a hydrogen atom bonded to a highly electronegative atom (like O or N) that can participate in hydrogen bonding with another ether molecule. The oxygen in dimethyl ether cannot form hydrogen bonds with the hydrogen atoms of other dimethyl ether molecules.
- **Conclusion**: Intermolecular hydrogen bonding is not present.

3. **Final Answer**:
- The compound that does not exhibit intermolecular hydrogen bonding is **D: CH3OCH3 (Dimethyl Ether)**.