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Chapter 14: Hydrocarbons

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1. Emma is studying the properties of alkanes. She knows that alkanes undergo halogenation reactions. What is halogenation?

A Reaction of alkanes with halogens
B Reaction of alkanes with oxygen
C Reaction of alkanes with hydrogen
D Reaction of alkanes with water

2. Uma is studying the properties of alkanes. She knows that alkanes are non-polar and have low boiling points. Which alkane is a gas at room temperature?

A Hexane
B Octane
C Methane
D Decane

3. Rachel is studying the halogenation of alkanes. She knows that bromine reacts with methane in the presence of UV light. What is the product when one bromine atom substitutes one hydrogen atom?

A CH3Br
B CH2Br2
C CHBr3
D CBr4

4. Which hydrocarbon is also called acetylene?

A Ethane
B Ethene
C Ethyne
D Propene

5. Victor is studying the dehydrogenation of alkenes to alkynes. He knows that alkenes can be dehydrogenated to alkynes. What is the product when ethene is dehydrogenated?

A Methane
B Ethane
C Ethyne
D Propane

6. Nora is studying the properties of alkanes. She knows that alkanes are generally unreactive but undergo combustion and halogenation. What type of reaction is halogenation?

A Addition reaction
B Substitution reaction
C Elimination reaction
D Rearrangement reaction

7. David is studying the cracking of larger hydrocarbons. He knows that cracking is used to produce smaller, more useful hydrocarbons. What is cracking?

A Breaking down large hydrocarbon molecules into smaller ones
B Combining small hydrocarbons into larger ones
C Adding halogens to hydrocarbons
D Burning hydrocarbons in oxygen

8. Quinn is studying the reduction of alkyl halides. He knows that alkyl halides can be reduced to alkanes. What is the reducing agent for converting iodomethane (CH3I) to methane?

A Zn/HCl
B H2/Ni
C NaBH4
D LiAlH4

9. Which condition is required for halogenation of alkanes?

A Darkness
B Sunlight or UV light
C Low temperature
D Water

10. Structural isomers have the same:

A Structural formula
B Chemical properties only
C Molecular formula
D Physical properties

11. Which hydrocarbon is commonly used as fuel?

A Ethyne
B Methane
C Ethene
D Propene

12. Which hydrocarbon shows structural isomerism first?

A Ethane
B Propane
C Butane
D Methane

13. Fatima is learning about the combustion of alkanes. She knows that alkanes burn in oxygen to produce carbon dioxide and water. What type of reaction is combustion?

A Endothermic
B Exothermic
C Neutralization
D Precipitation

14. Which type of hydrocarbons contain only single bonds?

A Alkenes
B Alkynes
C Alkanes
D Aromatic hydrocarbons

15. Which hydrocarbon turns bromine water colorless?

A Alkane
B Alkene
C Cycloalkane
D Saturated hydrocarbon

16. Which hydrocarbon contains a double bond?

A Alkane
B Alkene
C Alkyne
D Cycloalkane

17. Lara is studying the halogenation of methane. She knows that chlorine reacts with methane in the presence of UV light. What is the product when one chlorine atom substitutes one hydrogen atom?

A CH2Cl2
B CH3Cl
C CHCl3
D CCl4

18. Nora is studying the halogenation of alkanes. She knows that UV light is required for halogenation. What is the role of UV light in halogenation?

A To provide energy to break the halogen-halogen bond
B To increase the temperature
C To act as a catalyst
D To remove byproducts

19. Zara is studying the combustion of alkanes. She knows that alkanes are used as fuels. Which of the following is a clean-burning fuel?

A Coal
B Methane
C Diesel
D Gasoline

20. Sam is learning about complete combustion. She knows that complete combustion of alkanes produces carbon dioxide and water. What is the ratio of carbon dioxide to water produced when butane (C4H10) undergoes complete combustion?

A 4:5
B 4:10
C 2:5
D 4:1

21. Rachel is studying the cracking of larger hydrocarbons. She knows that cracking is used to meet the demand for gasoline. Which fraction of petroleum is cracked to produce more gasoline?

A Petroleum gas
B Naphtha
C Diesel
D Residue

22. Ahmed is studying hydrocarbons. He learns that alkanes are saturated hydrocarbons with single bonds. What is the general formula for alkanes?

A CnH2n
B CnH2n+2
C CnH2n-2
D CnHn

23. The molecular formula of propane is:

A C2H6
B C3H6
C C3H8
D C4H10

24. Which pair represents structural isomers?

A Ethane and propane
B Butane and isobutane
C Ethene and ethyne
D Methane and ethane

25. Khalid is learning about the cracking of larger hydrocarbons. He knows that dodecane (C12H26) can be cracked to produce smaller hydrocarbons. What is one possible product of cracking dodecane?

A Methane and octane
B Pentane and heptane
C Ethane and decane
D All of the above

26. Ming is studying the cracking of larger hydrocarbons. He knows that cracking produces alkenes, which are more reactive than alkanes. What is the use of alkenes produced from cracking?

A As fuels
B As starting materials for polymers
C As solvents
D As cleaning agents

27. Structural isomers differ in their:

A Number of atoms
B Arrangement of atoms
C Molecular mass
D Chemical formula

28. Chloe is learning about the dehydrogenation of alkenes. She knows that alkenes can be converted to alkanes by adding hydrogen. What is this reaction called?

A Oxidation
B Hydrogenation
C Halogenation
D Combustion

29. Khalid is learning about the preparation of alkanes by the reduction of alkyl halides. He uses 2-bromobutane (C4H9Br) and reduces it. What alkane is formed?

A Butane
B Pentane
C Propane
D Ethane

30. General formula of alkanes is:

A CnH2n
B CnH2n+2
C CnH2nāˆ’2
D CnHn

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