Quiz  /  Hydrocarbons Class 12 MCQ Questions With Answers

  • 1. 
    Which of the following has the highest boiling points

  • alkanes
  • alkenes
  • alkynes
  • alkanols

  • 2. 
    Which of the following would have the highest melting point?

  • C3H8
  • C4H8
  • C5H12
  • C22H44

  • 3. 
    Which of the following could contain a triple bond?

  • C4H10
  • C4H8
  • C4H6
  • C4H12

  • 4. 
    Which one of the following is saturated?

  • water
  • C4H8
  • C4H10
  • C5H8

  • 5. 
    The molecular formula for Heptane is

  • C4H10
  • C7H18
  • C5H12
  • C7H16

  • 6. 
    Which of the following generally undergoes substitution reactions

  • alkanes
  • alkenes
  • Alkanes and alkenes
  • algebras

  • 7. 
    Which of the following is more volatile?

  • petrol
  • diesel
  • oil
  • my temper

  • 8. 
    The following compounds have a molecular formula of

  • CnH2n+2
  • CH4
  • C6H14
  • CH3CH2CH2CH2CH2CH3

  • 9. 
    What is a cycloalkane?

  • a cyclic hydrocarbon
  • a cyclic hydrocarbon that contains only single bonds
  • a cyclic hydrocarbon with at least one alkyl group
  • a six-carbon alkane in the shape of a ring

  • 10. 
    Which of the following elements must be present in any organic compound?

  • Carbon
  • Oxygen
  • Potassium
  • Hydrogen

  • 11. 
    Which of the following elements do hydrocarbons contain?

  • carbon and oxygen only
  • carbon and hydrogen only
  • carbon, hydrogen, and oxygen
  • nitrogen, phosphorus, oxygen, sulfur, and the halogens

  • 12. 
    _____Hydrocarbons that contain only single covalent bonds between carbon atoms are called

  • alkanes.
  • alkenes.
  • alkynes.
  • unsaturated.

  • 13. 
    Identify the main characteristics of an organic compound

  • High melting point
  • polar
  • conductor
  • can exist in solid, liquid, and gas

  • 14. 
    Choose The correct name of the following compound:

  • 4,6-dimethyl-2-heptene.
  • 3,5-dimethyl-2-heptene.
  • 4,6-dimethyl-2-hexane.
  • 2,6-dimethyl-2-heptene.

  • 15. 
    Which of the following is a correctly named alkene?

  • 1,3-butane
  • 3-butene
  • 1,3-butene
  • 1-butene

  • 16. 
    Which of the following is an example of an organic compound?

  • methane
  • water
  • table salt
  • carbon dioxide

  • 17. 
    Which is an organic compound?

  • Carbon Dioxide
  • Carbon Monoxide
  • Carbonates
  • Ethane

  • 18. 
    Identify the main characteristics of an organic compoung

  • Low melting point
  • nonpolar
  • non-conductor
  • All of the above

  • 19. 
    ._____When the longest straight-chain in a hydrocarbon contains seven carbons, its prefix is

  • pent-
  • hex-.
  • hept-.
  • oct-.

  • 20. 
    How many carbon atoms are in a molecule of pentane?

  • 3
  • 4
  • 5
  • 6

  • 21. 
    ._____The alkyl group with the formula —CH2—CH3 is called

  • methyl.
  • ethyl.
  • propyl.
  • butyl.
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