Question Detail
Question
How does molecular shape affect the strength of London dispersion forces?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Molecular shape affects London dispersion forces because long, skinny molecules can pack together more efficiently, creating greater surface area contact and stronger intermolecular interactions. Spherical molecules have less surface area for contact, resulting in weaker dispersion forces and lower boiling points, as seen when comparing n-pentane (bp 309.4 K) and neopentane (bp 282.7 K).
Hint
Greater surface contact between molecules increases dispersion forces.