Question

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

Answer 1

1. Ethene. It is an unsaturated hydrocarbon with double bond between two carbon atoms while rest are saturated hydrocarbons with single bond between two carbon atoms.

2. CaCO₃. It is a salt which is an inorganic’ compound, while rest are hydrocarbon compounds, i.e. organic compounds.

3. C₂H₂ . It is an unsaturated hydrocarbon with triple bonds while rest are saturated hydrocarbons with single bonds between two carbon atoms.

4. Methane. It is a marsh gas while rest are allotropes of carbon.

5. Cotton. Cotton is a natural fibre while rest all are fossil fuels.

6. Proteins. Proteins are carbonaceous nutrients while rest all are natural fibres.

7. Coal. Coal is a fossil fuel while rest all are carbonaceous nutrients.

8. Charcoal. Charcoal is a non-crystalline form of carbon while rest all are types of coal.

9. Ornaments. Ornaments are made from diamonds while rest all are made from graphite.