Find the odd man out:
1. Propane, Methane, Ethene, Pentane.
2. CH4, C2H6 , C3H8 , CaCO3.
3. C2H2 , C3H8 , C2H4 ,CH4
4. Diamond, Fullerene, Graphite, Methane.
5. Coal, Petroleum, Natural gas, Cotton
6. Cotton, Silk, Proteins, Wool
7. Carbohydrates, Coal, Proteins, Fats
8. Peat, Charcoal, Lignite, Bituminous
9. Lubricants, Electrodes, Ornaments, Arc Lamps