In cracking, what is the primary purpose of a catalyst?

• A. The catalyst helps crack long chains into shorter molecules.
• B. The catalyst adds long chains.
• C. The catalyst prevents cracking.
• D. The catalyst uses oxygen to oxidize.

Answer: (A)

In cracking, a catalyst speeds up the breaking of long hydrocarbon chains into shorter molecules by providing an alternative pathway with lower activation energy. This means the bonds can break more readily at the temperatures used, making the process faster and more efficient without the catalyst being consumed. The catalyst doesn’t add longer chains, it doesn’t stop cracking, and cracking here doesn’t rely on oxidation with oxygen. So the statement that the catalyst helps crack long chains into shorter molecules best describes its role.