An alkene reacts with bromine. The relative formula mass of the product is 202.
Relative atomic mass (ArA_rAr): H = 1.0 C = 12.0 Br = 80.0
What is the alkene?
Ethene, C2H4\mathrm{C_{2}H_{4}}C2H4
Propene, C3H6\mathrm{C_{3}H_{6}}C3H6
Butene, C4H8\mathrm{C_{4}H_{8}}C4H8
Propane, C3H8\mathrm{C_{3}H_{8}}C3H8
63 exam-style questions on OCR GCSE Chemistry 6.2 Organic chemistry, covering 6.2.1 Crude oil and fractional distillation, 6.2.2 Cracking and dependence on hydrocarbons, 6.2.3 Functional groups and homologous series, 6.2.4 Reactions of alkanes, alkenes and alcohols, 6.2.5 Addition polymerisation and repeat units, 6.2.6 Naturally occurring polymers, 6.2.7 Chemical cells and fuel cells, and 6.2.8 Condensation polymerisation and how to make one. Each one has a worked solution and a mark scheme showing where the marks go.