An industrial chemist is optimizing the cracking of long-chain alkanes to produce hydrocarbons suited for motor fuels (high-grade petrol), which require branched-chain alkanes, cycloalkanes, and aromatic hydrocarbons.
Which row in the table correctly identifies the cracking process, the reaction conditions, and the primary products needed?
| Process | Typical Conditions | Catalyst | Primary Products | |
|---|---|---|---|---|
| A | Catalytic | 720 K, slight pressure | Zeolite | Branched alkanes, cycloalkanes, and aromatics |
| B | Thermal | 1000 K, high pressure | None | Branched alkanes, cycloalkanes, and aromatics |
| C | Catalytic | 720 K, high pressure | Zeolite | High proportion of alkenes (e.g. ethene) |
| D | Thermal | 1000 K, slight pressure | Alumina | High proportion of alkenes (e.g. ethene) |
Row A
Row B
Row C
Row D
9 exam-style questions on AQA A Level Chemistry Alkanes, covering Fractional distillation of crude oil, Modification of alkanes by cracking, Combustion of alkanes, and Chlorination of alkanes. Each one has a worked solution and a mark scheme showing where the marks go.