Quiz  /  Hydrocarbons Gate & PSU MCQ Questions With Answers

  • 1. 
    State the type of reaction of the above reaction.

  • Nucleophilic Addition Reaction
  • Electrophilic Substitution reaction
  • Free Radical Substitution reaction
  • Rearrangement

  • 2. 
    Which of the following undergoes addition reactions

  • alkanes
  • alkanes and alkenes
  • alkanes and alkynes
  • alkenes

  • 3. 
    As the number of carbons increases in an homologous series the melting point generally...

  • increase
  • decrease
  • stay the same
  • varies

  • 4. 
    Which of the following is correct about structural isomers?

  • They have different molecular formulas
  • They must have any double or triple bonds in the same position
  • They can be either positional or chain isomers
  • They must have the same length main chain

  • 5. 
    Benzene undergo electrophilic substitution NOT addition because

  • Stability of benzene ring
  • Stability due to delocalization of π electron in benzene
  • Delocalization of π electron in benzene
  • Benzene is unreactive

  • 6. 
    Which carbocation is most stable and why?

  • 1°carbocation because of strong inductive effect
  • 1°carbocation because of weak inductive effect
  • 3°carbocation because of weak inductive effect
  • 3°carbocation because of strong inductive effect

  • 7. 
    Reaction between Benzene + Br2 is called

  • Electrophilic addition
  • Electrophilic substitution
  • Nucleophilic addition
  • Nucleophilic substitution

  • 8. 
    All alkanes are soluble in water

  • true
  • false
  • depends on the number of carbons and branching
  • depends of the temperature

  • 9. 
    Diagram shows the formation of

  • 1° carbocation
  • 2° carbocation
  • 3° carbocation
  • None of the above

  • 10. 
    How many steps of mechanism for Free Radical Substitution Reaction of Alkane.

  • 1
  • 2
  • 3
  • 4

  • 11. 
    Electrophilic Addition involves...

  • The addition of a nucleophile to an alkane
  • The addition of a electrophile to an alkane
  • The addition of a electrophile to an alkene
  • The subtraction of a nucleophile to an alkene

  • 12. 
    If an alkene reacts with a halogen, it is known as what type of reaction?

  • Addition
  • Combustion
  • Polymerisation
  • Hydrogenation

  • 13. 
    What would you make if you added Hydrogen to Ethene?

  • Ethane
  • Propane
  • 1,2 - dihydroethane
  • Ethanol

  • 14. 
    Hydrogenation conditions are...

  • Powdered nickel catalyst, heat, pressure of 5ATM
  • Powdered nickel catalyst, room temperature and pressure
  • Water as steam, high pressure, with a silica catalyst
  • Aqueous hydrogen bromide

  • 15. 
    Propene + Steam would make?

  • Propan-1-ol
  • Propan-2-ol
  • Propan-1-ol and propan-3-ol
  • Propan-1-ol and propan-2-ol

  • 16. 
    Both alkanes and alkenes react rapidly with aqueous bromine at room temperature.

  • True
  • False
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