As part of a life-cycle assessment of alternative aviation fuels, a chemist investigates the catalytic cracking of bio-dodecane (C12H26\text{C}_{12}\text{H}_{26}C12H26), a saturated constituent of bio-paraffin. The cracking of one molecule of bio-dodecane yields exactly one molecule of propene, one molecule of but-1-ene, and a single molecule of product XXX.
Which of the following correctly identifies the molecular formula of product X X\,X and states whether it is saturated or unsaturated?
C5H10\text{C}_5\text{H}_{10}C5H10, which is unsaturated
C5H10\text{C}_5\text{H}_{10}C5H10, which is saturated
C5H12\text{C}_5\text{H}_{12}C5H12, which is saturated
C5H12\text{C}_5\text{H}_{12}C5H12, which is unsaturated
Practise OCR GCSE Chemistry Organic chemistry with exam-style questions for Foundation and Higher tier. 100 questions, matched to the OCR GCSE Chemistry (J248) specification and written in Paper 1 and Paper 2 (Foundation Tier) or Paper 3 and Paper 4 (Higher Tier) 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.