A heavy fraction of crude oil containing tetracosane, C24H50\text{C}_{24}\text{H}_{50}C24H50, is thermally cracked in a refinery to produce dodecane, C12H26\text{C}_{12}\text{H}_{26}C12H26, and another short-chain hydrocarbon as shown below:
C24H50→C12H26+4 ………… \text{C}_{24}\text{H}_{50} \rightarrow \text{C}_{12}\text{H}_{26} + 4 \, \dots\dots\dots\dots C24H50→C12H26+4…………Complete the balanced symbol equation for this cracking reaction by finding the missing chemical formula.
A laboratory technician has two unlabelled bottles containing colourless liquids: Compound P (C5H12\text{C}_5\text{H}_{12}C5H12) and Compound Q (C5H10\text{C}_5\text{H}_{10}C5H10). To identify them, the technician adds a few drops of orange-brown bromine water to a sample of each compound.
Explain, in terms of their bonding, why Compound Q decolourises the bromine water whereas Compound P does not.
Write the balanced symbol equation for the addition reaction of Compound Q with bromine, Br2\text{Br}_2Br2.
83 exam-style questions on OCR GCSE Chemistry Organic chemistry. Each one has a worked solution and a mark scheme showing where the marks go.