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Chemistry of Hydrocarbons /
Quiz 2

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NCAT Practice Test - Practice Test - Chemistry - Chemistry of Hydrocarbons Quiz

Attempt 10 MCQs on NCAT Practice Test - Practice Test - Chemistry - Chemistry of Hydrocarbons | Quiz 2

11. What is a characteristic of a free radical?

Unpaired electron
Paired electrons
Negative charge
Positive charge

12. Which step in free radical mechanism creates radicals from non-radicals?

Initiation
Propagation
Termination
Chain transfer

13. Which step of free radical reaction maintains the chain by producing another radical?

Propagation
Initiation
Termination
Inhibition

14. What step consumes radicals and stops the chain?

Termination
Propagation
Initiation
Chain branching

15. What is the reaction that produces a methyl radical?

Cl• + CH4 -> HCl + •CH3
•CH3 + Cl2 -> CH3Cl + Cl•
Cl2 -> 2Cl•
•CH3 + •CH3 -> C2H6

16. Which step regenerates the chlorine radical?

•CH3 + Cl2 -> CH3Cl + Cl•
Cl• + CH4 -> HCl + •CH3
Cl2 -> 2Cl•
•CH3 + •Cl -> CH3Cl

17. Which of the following is a termination reaction?

•CH3 + •Cl -> CH3Cl
•CH3 + CH4 -> CH4 + •CH3
Cl• + Cl• -> Cl2
•CH3 + •CH3 -> C2H6

18. What is the slow step in free radical bromination of methane?

Hydrogen abstraction
Bromine radical formation
Methyl radical + Br2
Termination

19. Which halogenation is more selective?

Bromination is more selective
Chlorination is more selective
Both are equally selective
Neither is selective

20. What are the steps that repeat in the mechanism?

Propagation steps
Initiation
Termination
Chain transfer

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