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Across
  1. 4. Graph showing energy interactions
  2. 5. Study of chemical reactions involving light
  3. 6. Step sustaining chain reaction
  4. 9. Addition of hydrogen to unsaturated bonds
  5. 10. Emission of light after excitation
  6. 14. Used to detect conjugated systems
  7. 15. Reaction adding halogen atoms
  8. 17. Decomposition by light
  9. 18. Step forming radicals
  10. 19. Area under NMR peak showing quantity
Down
  1. 1. Introducing nitro group to aromatic ring
  2. 2. Part of molecule absorbing light
  3. 3. Step ending radical reaction
  4. 7. NMR peak position indicator
  5. 8. Used to identify functional groups
  6. 11. Study of interaction with light
  7. 12. Detects carbon environment in molecule
  8. 13. Splitting of NMR peaks by neighbors
  9. 16. Cleavage of alkenes using ozone
  10. 17. Detects hydrogen environment in molecule
  11. 20. Species with unpaired electron