Answer and explanation

Correct answer: C. To break large hydrocarbons into smaller, more useful ones

  1. Step 1: Cracking uses heat and a catalyst. Step 2. It makes shorter alkanes and alkenes in demand. Answer: To break large hydrocarbons into smaller, more useful ones. Why not the others: Fractional distillation separates the fractions.

Practise more Reactions Acids Electrolysis and Organic Chemistry.

Free questions with an explanation for every one, and full timed UK GCSE mock tests.