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