CHEMISTRY · Single correct · A Level · Chemistry · Bonding · Bonding
Problem
Despite their similar molar masses, benzene (C6H6) boils at 80 °C whereas n-hexane (C6H14) boils at 69 °C. Which of the following best accounts for the higher boiling point of benzene?
(a) n-Hexane molecules are non-polar and therefore experience no intermolecular attractions.
(b) Benzene molecules are polar because of their ring, leading to dipole–dipole interactions that raise the boiling point.
(c) The delocalized π electrons in benzene make its electron cloud highly polarizable, increasing London dispersion forces between molecules.
(d) Benzene’s planar shape lets the rings stack very closely, so the molecules have greater surface contact and stronger dispersion forces.