Question

Which of the following is true regarding hydrophobic interactions between nonpolar molecules or groups?

a) They are entropy-driven
b) They involve the attraction of polar groups
c) They are stronger in polar solvents
d) They are weakened by the presence of water

Answer 1

Answer: (D.) They are weakened by the presence of water.

Explanation: Hydrophobic interactions involve nonpolar molecules or groups avoiding water. In the presence of water, these interactions are weakened, as nonpolar molecules tend to cluster together to minimize their contact with water.

Answer 2

Hydrophobic interactions between nonpolar molecules or groups are weakened by the presence of water. The option (D) is correct.

Step-by-step explanation:

Hydrophobic interactions between nonpolar molecules or groups occur due to the hydrophobic effect. Hydrophobic interactions are not entropy-driven and do not involve the attraction of polar groups. Instead, they occur because water molecules form stronger hydrogen bonds with each other than with nonpolar molecules.

Therefore, option d) They are weakened by the presence of water is the correct answer, as hydrophobic interactions are weaker in the presence of water.