A-Level UK (AQA, Edexcel, OCR) · Chemistry

Organic chemistry: structure and reactions

23 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 23 questions

  1. What is the IUPAC name of CH3CH(CH3)CH2CH2OH?
  2. How many structural isomers does pentane (C5H12) have, including pentane itself?
  3. Which compound shows E/Z isomerism?
  4. Which equation shows a propagation step in the free radical substitution of methane with chlorine?
  5. Propene reacts with hydrogen bromide. Which is the major product and why?
  6. Why does 2-bromo-2-methylpropane hydrolyse mainly by an SN1 mechanism?
  7. Heating a bromoalkane with ethanolic potassium hydroxide produces which type of product?
  8. Ethanol is heated under reflux with acidified potassium dichromate(VI). What is the product?
  9. Which reagent gives a silver mirror with ethanal but not with propanone?
  10. What are the conditions for making methyl ethanoate from ethanoic acid and methanol?
  11. Ethyl ethanoate is hydrolysed by heating with aqueous sodium hydroxide. What are the products?
  12. Which polymer forms from the monomer CH2=CHCl, and what is its repeat unit?
  13. Bromoethane is reacted with a large excess of ammonia in ethanol. Why is excess ammonia used?
  14. The enthalpy of hydrogenation of cyclohexene is -120 kJ mol-1 and that of benzene is -208 kJ mol-1. What is the delocalisation energy of benzene?
  15. Which feature in an infrared spectrum shows that a compound is a carboxylic acid?
  16. How many peaks are in the carbon-13 NMR spectrum of propanone, CH3COCH3?
  17. In the proton NMR spectrum of ethanol, CH3CH2OH, what is the ratio of peak areas (integration)?
  18. In paper chromatography, a spot moves 3.6 cm while the solvent front moves 7.2 cm. What is the Rf value?
  19. Which structure represents glycine as a zwitterion?
  20. Bromoethane reacts with potassium cyanide, then the product is reduced with LiAlH4. What is the final product?
  21. What is the product of the reaction between ethanoyl chloride and ethanol at room temperature?
  22. Which reagent reduces propanal to propan-1-ol?
  23. Which is a possible product of cracking decane, C10H22?

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