Why is cracking important in industry?

• A. Long chain alkanes are converted into more useful shorter chain alkanes and alkenes which are in higher demand
• B. It removes impurities from fuels
• C. It increases the calorific value of fuels
• D. It reduces emissions of sulfur dioxide

Answer: (A)

Cracking is about breaking down large, heavy hydrocarbon molecules into smaller, more useful ones. In industry, crude oil contains long-chain alkanes that aren’t as valuable as fuels or as chemical feedstocks. By cracking, these long chains are converted into shorter-chain alkanes and alkenes, which are in higher demand for petrol-range fuels and as starting materials for plastics and other chemicals. This makes crude oil more versatile and profitable to process. The other options don’t fit: removing impurities is done in refining, not cracking; cracking doesn’t by itself increase the energy content of fuels; and sulfur dioxide emissions are addressed by desulfurization, not cracking.