Chemistry of Fullerene - 2 MCQ

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• Heating C60/C70 mixtures in toluene with excess KOH results in the formation of which of the following compounds?
  ক

  Alkali metal fullerides

  খ

  Fullerols

  গ

  Hydrofullerenes

  ঘ

  Charged amino radical
• Why are fullerenes electronegative?
  ক

  Exhibit super aromaticity

  খ

  Empty low lying π* orbitals exhibit high s – character

  গ

  Severe extension of the p-lobes into the sphere of fullerene

  ঘ

  Presence of delocalized electrons that conduct electricity
• How does K3C60 behave at temperatures in the order of 10 – 40 K?
  ক

  Conductor

  খ

  Semiconductor

  গ

  Insulator

  ঘ

  Superconductor
• What product is obtained when C60 is reacted with nitric acid and sulphuric acid followed by an aqueous base?
  ক

  Hydrogenated fullerenes

  খ

  Hydroxylated fullerenes

  গ

  Oxygenated fullerenes

  ঘ

  Chlorinated fullerenes
• Fullerenes behave as electrophiles and hence can only undergo nucleophilic additions.
  ক

  True

  খ

  False
• Why isn’t C60 super aromatic?
  ক

  Occurrence of excellent electron delocalization

  খ

  Electron deficient alkene

  গ

  Pentagonal rings have double bonds within

  ঘ

  It follows Hirsch’s rule for aromaticity
• What are the reaction conditions for the catalytic hydrogenation of C60?
  ক

  Temp = 800°C – 900°C; Pressure = 1bar; Radical promoter = iodomethane

  খ

  Temp = 600°C – 750°C, Pressure = 0.1MPa; Radical promoter = bromoethane

  গ

  Temp = 400°C – 450°C, Pressure = 70bar; Radical promoter = iodoethane

  ঘ

  Temp = 50°C – 100°C; Pressure = 6MPa; Radical promoter = bromomethane