Intermolecular forces

Question 1

What are the types of intermolecular forces?

Answer 1

1. Dispersion forces
2. Dipole-dipole interaction
3. Hydrogen bonding
4. Ionic interaction

Question 2

Why are hydrophobic interactions thermodynamically feasible?

(part 3)

Answer 2

1. Gibbs free energy formula
2. Enthalpy change is negative because weak id-id interactions between water and the hydrophobic molecule are broken and strong H bonds between water molecules are formed
3. The freeing of ordered water molecules from the surface of the organic molecules contributes to increase in entropy (S is positive)
4. Gibbs free energy is negative, so it is spontaneous

Question 3

What are the criteria for a molecule to be considered as aromatic?

Answer 3

1. (4n+2) pi electrons
2. Cyclic conjugated planar system

Question 4

Why is sulfur a weak acceptor of hydrogen bond?

Answer 4

It