Question

Which of the following is the strongest?

	a.	Ionic interactions
	b.	Permanent dipole-permanent dipole interactions
	c.	London dispersion forces
	d.	Colinear hydrogen bonds

Which of the following is the best explanation for the hydrophobic effect?

	a.	It is caused by the attraction of hydrophobic groups for each other.
	b.	It is an entropic effect caused by the desire of hydrophobic groups to increase their entropy by associating with other hydrophobic groups.
	c.	It is an entropic effect, caused by the desire of water molecules to increase their entropy by forming highly ordered structures around the hydrophobic groups.
	d.	It is caused by the attraction of water for hydrophobic groups.
	e.	It is an entropic effect, caused by the desire of water molecules to increase their entropy by excluding hydrophobic groups, which they must otherwise surround with highly ordered structures.

Answer 1

(1) Which of the following is the strongest?

The correct order of forces is : Ionic forces > Hydrogen bonding > dipole - dipole interactions > Van derwalls forces

Therefore the correct option is (a)

(2) Which of the following is the best explanation for the hydrophobic effect?

It is an entropic effect, caused by the desire of water molecules to increase their entropy by excluding hydrophobic groups, which they must otherwise surround with highly ordered structures.

Therefore option (c) is correct