Discussion
Catalytic cracking is preferred to thermal cracking because it gives a product of
Answer: B
Correct answer: higher octane number at milder conditions
A zeolite catalyst promotes the ionic route to cracking, which favours branched and aromatic products - exactly the high octane species petrol needs - and it does so at lower temperature and pressure than thermal cracking requires. Thermal cracking proceeds by free radicals and gives more straight chain product of lower octane, and it needs the severer conditions to go at all.
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