N-Pentane and neopentane are structural isomers with formula C5H12
CHEMISTRY · Single correct · A Level · Chemistry · Bonding · Bonding
Problem
n-Pentane and neopentane are structural isomers with formula C5H12. Which statement best explains why n-pentane has a higher normal boiling point than neopentane?
(a) n-Pentane is more polar than neopentane, so dipole–dipole attractions give it the higher boiling point
(b) Branching in neopentane increases the contact area between molecules, strengthening dispersion forces relative to n-pentane
(c) n-Pentane molecules can align over a larger surface area, leading to stronger London dispersion forces
(d) The straight-chain structure of n-pentane permits hydrogen bonding that neopentane cannot form, raising its boiling point