On which fundamental physical property does the industrial fractional distillation of crude petroleum oil rely to separate its various hydrocarbon fractions?

Answer and explanation

Correct answer: B. Differences in the boiling point temperatures of hydrocarbon molecules

  1. Step 1: Recall refinery distillation principles: crude oil is a complex mixture of alkanes of varying carbon chain lengths.
  2. Step 2: Longer carbon chains have larger molecular sizes and stronger intermolecular van der Waals forces, resulting in higher boiling points. In a fractionating column, vapors condense at heights matching their condensation temperatures.
Answer
Differences in the boiling point temperatures of hydrocarbon molecules.
Why not the others: 'Differences in the chemical solubilities of hydrocarbons in aqueous acid' is false as hydrocarbons are insoluble in water and acids; 'Differences in the electrical conductivities of saturated aliphatic chains' is irrelevant as hydrocarbons do not conduct electricity; 'Differences in the rates of radioactive decay among natural petroleum isotopes' is scientifically unfounded.

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