Alkanes, Alkenes and Alkynes

Which one of the following substances is NOT considered to be an organic compound?
1. Carbon monoxide
2. Methane
3. Ethene
4. Iso-octane
The general name for the group of compounds that contain carbon and hydrogen only is
1. hydrocarbons.
2. carbohydrates.
3. alcohols.
4. alkynes.
The first four alkyl groups respectively are
1. methyl, ethyl, propyl and butyl.
2. methyl, propyl, butyl and pentyl.
3. ethyl, propyl, butyl and heptyl.
4. ethyl, methyl, hexyl and butyl.
Which one of the following hydrocarbons is a greenhouse gas?
1. Methane
2. Ethene
3. Ethyne
4. Propane
The structural isomer shown is for which one of the following compounds?
1. Pent-1-ene
2. Pentane
3. Pent-2-ene
4. Pent-1-yne
Which one of the following compounds is saturated?
1. 2,3-diethylbutane
2. 2-methylbutyne
3. 2,2,4-trimethylpent-2-ene
4. Ethyne
Name the hydrocarbon represented by the model in the photograph shown.
1. Propane
2. Methane
3. Propene
4. Butane
Bottled gas is a mixture of which of the following pairs of gases?
1. Butane and propane.
2. Methane and butane.
3. Propane and ethane.
4. Ethane and butane.
Which of the following is the general formula of the alkynes?
1. C_NH_2N+2
2. C_NH_2N-2
3. C_NH_2N
4. C_NH_N
Compounds with the same chemical formula but different structural formula are known as
1. isomers.
2. polymers.
3. isotopes.
4. aliphatic compounds.
Which of the following compounds is an isomer of butane?
Which of the following names is correct for the molecular structure shown?
1. 2,5-dimethylhexane
2. 2,5-dimethylheptane
3. 2-methylheptane
4. Iso-octane
What is the correct IUPAC name for this alkyl group
-C₄H₉
1. butyl group
2. propyl group
3. ethyl group
4. pentyl group
What is the correct IUPAC name for the following compound?
1. 3-ethyl, 2,5-dimethylhexane
2. 2-methyl, 3-ethylhexane
3. 2,3-dimethylhexane
4. 4-ethyl, 5-methylhexane
Which one of the following is the correct structural formula for cyclohexane?
1. C₆H₁₂
2. C₆H₁₄
3. C₅H₁₀
4. C₆H₁₀
Which hydrocarbon is represented by the structure shown?
1. Cyclohexene
2. Benzene
3. Cyclohexane
4. Methylbenzene
The diagram shows the apparatus used to prepare ethane.
Name the reagents X and Y.
1. X = ethanol and Y = aluminium oxide
2. X = ethane and Y = steel wool
3. X = ethanol and Y = glass wool
4. X = aluminium oxide and Y = ethanol
Which one of the following statements is correct?
1. Alkenes are less reactive than alkynes.
2. Alkanes are more reactive than alkenes.
3. Alkynes are less reactive than alkanes.
4. Alkynes are highly saturated hydrocarbons.
What is observed when ethene is reacted with acidified potasssium permanganate solution?
1. The purple colour of the permanganate disappears.
2. Nothing happens.
3. The gas, carbon dioxide is formed.
4. The permanganate burns with a smoky flame.
Acetylene is the traditional name for
1. ethyne.
2. ethene.
3. propene.
4. ethane.
Which of the following properties are those of ethyne?
1. A colourless, explosive gas with a sweet smell and insoluble in water.
2. A colourless, odourless gas, soluble in water and burns with a luminous flame.
3. Highly flammable gas with a sweetish smell. Turns limewater milky and reacts with bromine.
4. Colourless gas, insoluble in organic solvents. Burns with a luminous flame and reacts with acidified potassium permanganate.
The diagram shows the apparatus used for the preparation of ethyne.
Name X and Y.
1. X = calcium carbide and Y = copper sulfate solution.
2. X = water and Y = calcium carbide.
3. X = copper sulfate solution and Y = calcium carbide.
4. X = aluminium oxide and Y = acidified potassium permanganate solution.
Organic compounds that contain a benzene ring structure are known as
1. aromatic compounds.
2. aliphatic compounds.
3. covalent compounds.
4. saturated compounds.
Which of the following structures is the correct representation of benzene?
Benzene was discovered in 1825 by
1. Michael Faraday.
2. Friedrich August Kekule.
3. Wilhelm Bunsen.
4. John Dalton.
In the fractionating column shown, what are the fractions labelled X and Y? $fract.gif$
1. X = petrol and Y = bitumen.
2. X = petroleum gas and Y = lubricating oil.
3. X = lubricating oil and Y = petrol.
4. X = bitumen and Y = naphtha.
Bromine water becomes decolorised when it is reacted with ethene. However, bromine water is not decolorised when reacted with benzene. This indicates that
1. benzene does not contain double bonds.
2. benzene is a saturated hydrocarbon.
3. benzene is a polar compound.
4. benzene is an aromatic hydrocarbon.
Compounds which have the same molecular formula but different structural formula are known as
1. isomers.
2. polymers.
3. isotopes.
4. indicators.
Which one of the following is NOT typical of a homologous series?
1. Each successive members differs by CH
2. Its members have a general formula.
3. They have similar methods of preparation.
4. Their physical properties show gradual change as size of compounds increase.
Which is the correct formula for the hydrocarbon shown?
1. CH₃CH₂CH(CH₃)CH₂CH₃
2. CH₃CH₂CH(CH₃)CHCH₃
3. C₂H₅CH(CH₃)CHCH₃
4. CH₃CH(CH₃)CH₂CH₂CH₃
The empirical and molecular formula of benzene respectively are
1. CH and C₆H₆
2. CH₂ and C₆H₆
3. C₆H₆ and CH
4. C₂H₂ and C₆H₆
A molecule of propene contains
1. a carbon-carbon double bond.
2. a carbon-hydrogen double bond.
3. only carbon-carbon-single bonds.
4. a carbon-carbon triple bond.
The carbon-carbon triple bond in the ethyne molecule consists of
1. one sigma and two pi bonds.
2. two sigma and one pi bonds.
3. three sigma bonds.
4. three pi bonds.
The boiling points of hydrocarbons
1. increase with increasing molecular mass.
2. depends upon the number of double and triple bonds in the hydrocarbon.
3. decrease with increasing numbers of carbon atoms.
4. increase with decreasing molecular mass.
All organic compounds must contain
1. carbon.
2. carbon and oxygen.
3. carbon, hydrogen and oxygen.
4. carbon and nitrogen
Which one of the following statements is INCORRECT regarding aliphatic compounds?
1. Aliphatic compounds may contain benzene ring structures.
2. They are all classified as organic compounds.
3. They may include oxygen or nitrogen.
4. They may be chain or branched structures.
Which one of the following statements is correct concerning aromatic compounds?
1. Aromatic compounds contain the benzene ring structure in their molecules.
2. Aromatic compounds contain chains of carbon atoms only.
3. carbon-carbon double bonds must be present in the molecules of aromatic compounds.
4. Aromatic compounds do not contain hydrogen.
How many valence electrons does the carbon atom have?
1. 4
2. 6
3. 2
4. 1
Select the simplest hydrocarbon from the following list.
1. Methane.
2. Ethene.
3. Ethane.
4. 1-methylpropane
The condensed structural formula for 2,2-dimethylbutane is
1. CH₃C(CH₃)₂CH₂CH₃
2. C₃H₇
3. C₆H₁₄
4. CH₃CH(CH₃)CH(CH₃)CH₃
Which one of the following compounds is unsaturated?
1. C₃H₆
2. CH₃CH₂CH₃
4. C₄H₁₀
Which one of the following compounds is a saturated hydrocarbon?
1. Cyclohexane
2. Cyclohexene
3. Ethyne
4. Propene
Which of the following is a liquid at normal temperature and pressure?
1. Pent-1-ene
2. But-2-ene
3. Propane
4. Ethyne
Which one of the following hydrocarbons is a gas at normal temperature and pressure?
1. Butane
2. Cyclohexane
3. Hexane
4. 2,2,4-trimethylpentane (iso-octane)
Which one of the following molecules consists of a branched chain?
1. CH₃CH(CH₃)CH₂CH₃
2. CH₃CH₂CH₂CH₃
3. C₂H₆
4. C₆H₆
How many structural isomers does pentane have?
1. 3
2. 2
3. 4
4. none
Select the straight chain alkane from the following list:
1. CH₃CH₂CH₃
2. C₅H₈
3. CH₃CH(CH₃)CH₂CH₃
4. C₆H₅CH₃
What is the IUPAC name for the compound shown?
1. 3-methylheptane
2. 3-methyloctane
3. 5-methylheptane
4. 2-ethylhexane
Ethene burns in oxygen to form carbon dioxide and water. What are the coefficients required in order to balance the chemical equation for the combustion of ethene?
1. X = 2.5, Y = 2, Z = 1
2. X = 2, Y = 1, Z = 2
3. X = 2, Y = 3, Z = 2
4. X = 3, Y = 2, Z = 1
In which of the following pairs of solvents is methylbenzene soluble?
1. Cyclohexane and ethyl ethanoate
2. Water and ethyl ethanoate
3. Water and cyclohexane
4. Sodium chloride solution and water.
The diagram shows a method for preparing ethyne gas. The gas produced will contain impurities. Two of these impurities are
1. phosphine and hydrogen sulfide
2. phosphine and copper sulfate
3. copper sulfate and methane
4. methane and hydrogen sulfide
Which one of the following statements is INCORRECT?
1. Alkanes are much more stable than alkenes because of the presence of the C=C double bond.
2. The old name for the alkanes was the paraffins
3. Alkynes may have one or more triple bonds in their structure.
4. The simplest aromatic compound is benzene.

Alkanes, Alkenes and Alkynes

Multiple Choice Quiz