Carbon and its compounds

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Across
  1. 5. hexagonal rings
  2. 6. buckyfall
  3. 9. saturated
  4. 10. hydrogen and carbon
  5. 12. amorphous carbon
  6. 14. similar chemical properties
  7. 15. crystalline forms of carbon
Down
  1. 1. unsaturate
  2. 2. 95% of carbon
  3. 3. decolourising agent
  4. 4. forming long chains
  5. 7. better fuel than wood
  6. 8. four carbon atoms
  7. 11. pigment and colouring matter
  8. 13. free states of carbon