The structures of three organic compounds, P, Q, and R, are shown below:

Which of these compounds are hydrocarbons?
P only
P and R only
Q and R only
P, Q and R
Practise Edexcel GCSE Chemistry Fuels with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.