**Question:**What are the intermolecular forces of 1,3-diphenyl-2-propyn-1-one?---**Answer:**Intermolecular forces in 1,3-diphenyl-2-propyn-1-one include:1. **London Dispersion Forces:** Present in all molecules, these are weak interactions due to temporary dipoles in the electron cloud.2. **Dipole-Dipole Interactions:** Arising from the polar carbonyl group (C=O), where there is a partial negative charge on the oxygen and partial positive on the carbon.3. **π-π Interactions:** Due to the aromatic phenyl rings, which can engage in stacking interactions with each other.These forces contribute to the molecule's physical properties, such as boiling and melting points, solubility, and volatility.

Intermolecular forces refer to the type of interactions which are present in between atoms or molecules. These are responsible for holding different molecules together. There are mainly three types which are dispersion forces, dipole-dipole forces and hydrogen bonding. The type of forces which are present in between nonpolar molecules are known as dispersion forces. These forces are caused by the variations within the atoms or molecules due to the presence of electrons in it. These are weaker forces which are present in every molecule. The given molecule is 1,3-diphenyl-2-propyn-1-one. Draw the structure of the given compound. The given molecule is made up of C, H and O atoms. It contains single bond, double bond and triple bond in between the carbon and hydrogen atoms. The electronegativity difference in between the C and H atoms is very less. So, these bonds are nonpolar. The type of forces which are present in between polar molecules are known as dipole-dipole forces. The forces are present in between the positive end of one dipole and negative end of another dipole. The given molecule contains C=O bond. This bond is polar due to higher electronegativity difference in between the C and O atoms. So, it has dipole-dipole forces. Therefore, the intermolecular forces present in this molecule are dispersion forces and dipole-dipole forces.