A student makes three statements about the alkenes.
Statement 1: ethene and but-2-ene have the same percentage by mass of carbon
Statement 2: but-1-ene and but-2-ene have different relative formula masses
Statement 3: an alkene with 6 carbon atoms and one C=C bond has the formula C6H12\mathrm{C_{6}H_{12}}C6H12
Which statements are correct?
1 only
2 and 3 only
1 and 2 only
1 and 3 only
36 exam-style questions on Edexcel GCSE Chemistry 10.2 Hydrocarbons, covering 10.2.1 Formulae and structures of the alkanes, 10.2.2 Alkenes and the C=C functional group, 10.2.3 Addition reactions of alkenes and testing for unsaturation, and 10.2.4 Combustion of alkanes and alkenes. Each one has a worked solution and a mark scheme showing where the marks go.