Methylpropene has the structure CH2=C(CH3)2\mathrm{CH_{2}=C(CH_{3})_{2}}CH2=C(CH3)2.
Which row is correct for methylpropene?
C4H8\mathrm{C_{4}H_{8}}C4H8; decolourises bromine water; same molecular formula as but-1-ene
C4H8\mathrm{C_{4}H_{8}}C4H8; does not decolourise bromine water, as its chain is branched
C4H10\mathrm{C_{4}H_{10}}C4H10; decolourises bromine water; same molecular formula as butane
C3H6\mathrm{C_{3}H_{6}}C3H6; decolourises bromine water; same molecular formula as propene
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.