Chemistry - Hydrocarbons

Multiple Choice Quiz

There are 20 questions in this multiple choice quiz.
You may attempt this quiz as often as you wish.
Each time, you will be given a different set of questions.
Good luck!

What is the main component of natural gas?
1. Methane
2. Ethane
3. Propane
4. Ethene
In hydrocarbons, the C and H bonds are joined together by
1. covalent ions
2. hydrogen bonds
3. ionic bonds
4. dipole-dipole attractions
Coal is formed from
1. dead wood of ancient forests
2. marine animals that died millions of years ago
3. dead animals that existed millions of years ago
4. compressed natural gas
Which one of these is not a source of methane gas?
1. Burning coal
2. Ruminating animals such as cattle, sheep and pigs
3. Anaerobic decomposition of animal waste
4. Slurry pits
5. Refuse dumps
Which one of the following carbon compounds is considered to be an organic compound?
1. Methane
2. Carbon dioxide
3. Carbon monoxide
4. Calcium carbonate
Select three properties of aliphatic hydrocarbons.
1. They generally contain straight chains.
2. They may contain branched chains.
3. They may contain ring structures.
4. They all contain double bonds.
5. They are very unreactive.
Which two of the following are aromatic hydrocarbons?
Organic compounds are separated into groups called homologous series.
Which one of the following is not a property of a homologous series?
1. They have similar physical properties.
2. All members have the same general formula.
3. Successive members differ by CH₂.
4. They have similar chemical properties.
The naming of organic compounds follows a definite pattern, depending on the number of carbon atoms in its longest chain.
Select the correct root for the molecule that has 5 carbon atoms in its longest chain.
1. pent
2. hept
3. eth
4. prop
5. but
The general formula for the alkanes is
1. C_NH_2N+2
2. C_NH_2N
3. C_NH_2N-2
4. C_NH_2N+1
The formula that shows how atoms are arranged in a molecule is called the
1. structural formula
2. actual formula
3. molecular formula
4. empirical formula
The diagram shows the structural formula for which molecule?
1. hexane
2. heptane
3. propane
4. octane
5. butane
Select the correct structure of propane from those shown below:
Compounds that have the same molecular formula, but different structural formula are known as
1. isomers
2. polymers
3. isotopes
4. monomers
The isomer shown is known as
1. 2-methylbutane
2. 3-methylbutane
3. pentane
4. methylpentane
Which one of the following isomers is that of 2,2,4-trimethylpentane?
The general formula for the alkenes is
1. C_NH_2N+2
2. C_NH_2N
3. C_NH_2N-2
4. C_NH_2N+1
The general formula for the alkynes is
1. C_NH_2N+2
2. C_NH_2N
3. C_NH_2N-2
4. C_NH_2N+1
What is the name of the hydrocarbon shown?
1. 3-methylpentane
2. 2-ethylbutane
3. 2-dimethylbutane
4. 4-ethylbutane
What is the correct name for CH₃CH(CH₃)CH₂CH₃?
1. 2-methylbutane
2. Pentane
3. 3-methylbutane
4. Methylpentane
The structure
1. CH₃C(CH₃)₂CH₂CH(CH₃)CH₃
2. CH₃C(CH₃)CH₂CH(CH₃)CH₃
3. CH₃C(CH₃)₂CHCH(CH₃)CH₃
4. CH₃C(CH₃)₂CH₂CH(CH₃)
Which one of the following compounds is an alkyne?
Which one of the following compounds is unsaturated?
The condensed formula and name of this structural molecule is
1. CH₃C(CH₃)₂CH₂CH₃ and 2,2-dimethylbutane
2. CH₃C(CH₃)₂CH₂CH₃ and 2,2-methylbutane
3. CH₃(CH₃)₂CH₂CH₃ and 2,2-dimethylbutane
4. CH₃C(CH₃)CH₂CH₃ and 2,2-dimethylpropane
Which two of the following statements about alkanes are not correct?
1. They are soluble in water.
2. They are highly unreactive.
3. The first four members in the series are gases at normal temperatures and pressures.
4. Alkanes with more than 16 carbon atoms are solid at normal temperatures and pressures.
5. Their boiling points increase with increasing relative molecular mass (M_r).
6. Thay are non-polar substances.
The name and condensed formula of this alkene is
1. pent-2-ene and CH₃CH=CHCH₂CH₃
2. pent-3-ene and CH₃CH=CHCH₂CH₃
3. pent-2-ene and CH₃(CH₂)CH₃CH₃
4. pent-3-ene and CH₃CH=CHCH₃₃
Butene has three isomers. Select these three isomers from the following:
Which four of the following statements about alkenes are correct?
1. Their general formula is C_NH_2N
2. The C=C bond is their functional group.
3. Alkenes are unsaturated hydrocarbons
4. The boiling points of alkenes increase with relative molecular mass.
5. At normal temperatures and pressures, the first six members are liquids.
6. Alkenes are insoluble in non-polar solvents such as cyclohexane
The general formula of the alkenes is:
1. C_NH_2N
2. C_NH_2N+1
3. C_NH_2N+2
4. C_NH_2N-2
The compound shown is
1. 3,3-dimethylbut-1-ene
2. 2,2-dimethylbutene
3. 2,2-dimethylbut-1-ene
4. pentene
Which three of the following are properties of alkynes?
1. The lower members are gases at normal temperatures and pressures.
2. Alkynes have similar physical properties.
3. Alkynes are soluble in non-polar solvents like methylbenzene.
4. Their general formula is C_NH_2N+2
5. They are all soluble in water.
The diagram shows how ethyne gas is prepared in the laboratory. What are the reagents X and Y?
1. X = calcium carbide, Y = acidified CuSO₄
2. X = water, Y = acidified CuSO₄
3. X = calcium carbide, Y = sulfuric acid
4. X = calcium carbonate, Y = acidified CuSO₄
Which of the following equations best represents the reaction taking place when ethyne is produced in the laboratory?
1. CaC_2(s) + 2H₂O_(l) ---> C₂H_2(g) + Ca(OH)_2(aq)
2. CaC_2(s) + 2H₂O_(g) ---> C₂H_2(g) + Ca(OH)_2(aq)
3. 2CaC_2(s) + H₂O_(l) ---> C₂H_2(g) + ¹/₂O_2(g)
4. CaC_2(s) + 2H₂O_(l) ---> C₂H_2(g) + 2Ca(OH)_2(aq)
One of the raw materials used in preparing ethyne (C₂H₂) contains a number of impurities. Two of these impurities are:
1. calcium sulfide and calcium phosphide
2. calcium sulfide and hydrochloric acid
3. calcium carbonate and calcium phosphide
4. copper sulfate and calcium phosphide
The ethyne produced in the laboratory contains two known impurities which are removed by passing them through an acidified copper sulfate solution. These impurities are
1. hydrogen sulfide and phosphine
2. hydrogen sulfide and potassium
3. hydrogen sulfate and phosphine
4. copper sulfide and potassium
Ethyne gas may be tested for saturation in the laboratory. Select two positive tests from the following:
1. It decolorises acidified potassium permanganate solution.
2. It changes the colour of bromine water from red to colourless.
3. It changes the colour of lime-water to milky white.
4. It changes the colour of cobalt chloride paper blue to pink.
From the list below, select two compounds that ethyne will dissolve in.
1. Methylbenzene
2. Cyclohexane
3. Water
4. Dilute hydrochloric acid
5. Sodium chloride solution
Calcium carbide (CaC₂) is used to prepare ethyne gas. What does calcium carbide look like?
1. Grey solid.
2. Blue crystalline solid
3. Black powder
4. White solid
5. Colourless liquid
Which two of the following happen when ethyne gas is burned in air?
1. The gas burns with a yellow flame.
2. The gas burns with a smoky flame.
3. The gas burns with a loud bang.
4. Ethyne burns with a pop.
When ethyne is burned with a certain gas, it can produce temperatures hot enough to melt metals. This is made use of in welding. What is this other gas called?
1. Oxygen
2. Steam
3. Nitrogen
4. Carbon dioxide
5. Methane
Select four properties of simple aromatic compounds from the following list:
1. They contain a benzene ring.
2. They are generally insoluble in water.
3. Their boiling points increase with relative molecular mass.
4. They are soluble in non-polar solvents.
5. They contain C=C bonds in their ring structure.
6. The lighter aromatic compounds are gases at room temperature.
Why is benzene not permitted to be used in school laboratories?
1. It is classified as carcinogenic (cancer inducing).
2. It is highly flammable.
3. It is too expensive.
4. It reacts explosively with water.
The benzene molecule is correctly represented by
In a laboratory experiment, students tested the solubility of different solutes in methylbenzene. They made a table as shown. However, two of these results are incorrect. Select the two incorrect results from the list below
1. Salt water and octane
2. Salt water and cyclohexane
3. Cooking oil and water
4. Cyclohexane and iodine
TRUE or FALSE?
An exothermic reaction is one where heat is released
1. TRUE
2. FALSE
How can you determine if a reaction is endothermic?
1. The temperature of the system decreases.
2. The temperature of the system increases.
3. The temperature of the system remains constant.