Quick answer: IUPAC nomenclature names an organic compound from its longest carbon chain, its functional group and its substituents, with numbers giving their positions. This Chemistry 11-12 test on organic nomenclature has 8 questions worth 20 marks, to do in 45 minutes: naming, structural isomers and alcohols C₄H₁₀O. The mark scheme is on a separate page; free printable PDF.
This chemistry grades 11-12 test on organic nomenclature test works like a real class test, so the mark scheme is on a separate page, so revise with the lesson first.
This test covers naming, structural isomers, E/Z isomerism and optical isomerism. Answer every question, show working for calculations and also name compounds fully. Finally, you have 45 minutes and 20 marks are available.
Level: Chemistry grades 11-12 (A Level · IB · Class 11-12) · Curriculum: IB S3.2
Organic nomenclature test: the test questions
Question 1 Naming (3 marks)
- Firstly, name CH₃CH₂CH(CH₃)CH₂CH₃. (1 mark)
- Then name CH₃CH₂CH₂CHO. (1 mark)
- Finally, name CH₃CHBrCH₃. (1 mark)
Question 2 Structural isomers (2 marks)
- Firstly, define structural isomers. (1 mark)
- Then state the type of isomerism between propan-1-ol and propan-2-ol. (1 mark)
Question 3 Alcohols C₄H₁₀O (3 marks)
- Firstly, name the four alcohol isomers of C₄H₁₀O. (2 marks)
- Then identify the tertiary alcohol. (1 mark)
Question 4 E/Z isomerism (3 marks)
- Firstly, state whether isomer R is E or Z, giving a reason. (2 marks)
- Then explain why E/Z isomers exist. (1 mark)
Question 5 Chiral centre (2 marks)
- Explain why butan-2-ol is chiral, because it has a chiral centre. (2 marks)
Question 6 Optical rotation (3 marks)
- Firstly, a pure (+) enantiomer rotates light by +30.0°. A mixture rotates it by +12.0°. Then calculate the enantiomeric excess. (1 mark)
- Then calculate the percentage of (+) in the mixture. (2 marks)
Question 7 Name an alcohol (2 marks)
- Name CH₃CH(CH₃)CH(OH)CH₃. (2 marks)
Question 8 Same formula, different properties (2 marks)
- Ethanol (boiling point 78 °C) and methoxymethane (−24 °C) share the formula C₂H₆O. Then explain the difference in boiling points. (2 marks)
