Chemistry 0620 · IGCSE
Formulae, functional groups and terminology
100 practice questions on Formulae, functional groups and terminology, with worked solutions and instant marking.
Which pair of molecules are classed as hydrocarbons?
Feb/March 2016
Diagrams of three molecules are displayed. Which homologous series is absent?
Feb/March 2016
Data for four hydrocarbons is given. Which statement is correct?
Feb/March 2016
The statements here refer to the alcohol homologous series. All alcohols share the same ......1...... formula. Alcohols show ......2...... chemical properties because they contain the same ......3...... . As the number of carbon atoms rises, the melting points of the alcohols ......4...... . Which words correctly fill gaps 1-4?
Feb/March 2016
Alkanes and alkenes are both types of hydrocarbons.
Feb/March 2016
Which substance has a principal constituent that contains just one carbon atom in each molecule?
Feb/March 2017
Ethanol is a fuel used in cars. It can be manufactured from petroleum. $\text{C}_4\text{H}_{10} \rightarrow \text{C}_2\text{H}_4 + \text{C}_2\text{H}_6$ (cracking) $\text{C}_2\text{H}_4 + \text{H}_2\text{O} \rightarrow \text{C}_2\text{H}_5\text{OH}$ (producing ethanol) $\text{C}_2\text{H}_5\text{OH} + 3\text{O}_2 \rightarrow 2\text{CO}_2 + 3\text{H}_2\text{O}$ (burning) How many different homologous series are represented by the compounds in these equations?
Feb/March 2017
Caffeine is a stimulant present in coffee. Which formula is the one that represents caffeine?
Feb/March 2017
Ethanol is used as a fuel in cars. It can be produced from petroleum. $\text{C}_4\text{H}_{10} \rightarrow \text{C}_2\text{H}_4 + \text{C}_2\text{H}_6$ (cracking) $\text{C}_2\text{H}_4 + \text{H}_2\text{O} \rightarrow \text{C}_2\text{H}_5\text{OH}$ (producing ethanol) $\text{C}_2\text{H}_5\text{OH} + 3\text{O}_2 \rightarrow 2\text{CO}_2 + 3\text{H}_2\text{O}$ (burning) How many homologous series are represented by the compounds in these equations?
Feb/March 2017
Lavandulol is a compound present in lavender flowers. Its structure is displayed.
Feb/March 2017
Which row shows compounds that belong to the same homologous series?
Feb/March 2018
Which two statements about members of a homologous series are true? Tick two boxes. Their chemical properties are similar. Their physical properties are similar. They share the same functional group. Their relative molecular masses are identical. They contain the same number of carbon atoms.
Feb/March 2018
The formulae for five compounds are given below: 1. $\text{C}_4\text{H}_{10}$ 2. $\text{C}_2\text{H}_5\text{OH}$ 3. $\text{C}_4\text{H}_9\text{OH}$ 4. $\text{C}_4\text{H}_9\text{COOH}$ 5. $\text{C}_5\text{H}_{11}\text{OH}$ Which of these compounds belong to the same homologous series?
Feb/March 2019
Which of the following statements about members of a homologous series is correct?
Feb/March 2019
The structural formulae of two organic compounds, P and Q, are given below. P: $\text{CH}_3\text{CH}_2\text{CH}_2\text{OH}$ Q: $\text{CH}_3\text{CH} = \text{CHCH}_3$ What class of organic compounds do P and Q belong to?
Feb/March 2020
What kind of compound belongs to a homologous series?
Feb/March 2020
Which structure shows the ester produced from ethanoic acid and propanol?
Feb/March 2020
Molecule 1 is changed by a process to form molecule 2. molecule 1 $\xrightarrow{\text{process}}$ molecule 2 Which row gives the correct descriptions of the molecules and the process?
Feb/March 2021
A hydrocarbon has the formula $C_xH_y$. Its complete combustion is represented by the equation below. $C_xH_y + 8O_2 \rightarrow 5CO_2 + 6H_2O$ What are the values of $x$ and $y$?
Feb/March 2021
The ester has the formula $CH_3CH_2CH_2COOCH_2CH_2CH_3$. Which acid and which alcohol combine to form this ester?
Feb/March 2021
Molecule 1 is changed into molecule 2 by a process. Which row identifies the molecules and the process?
Feb/March 2021
The structure of compound A is displayed.
Feb/March 2021
Which row shows the homologous series that this molecular structure is part of?
Feb/March 2023
Which class of compound also gives its name to a homologous series?
Feb/March 2024
The structural formula of an organic compound is displayed. This compound is then tested separately using thymolphthalein and aqueous bromine. Which row shows the final colour seen in each test?
Feb/March 2024
Which molecules are classed as structural isomers?
Feb/March 2024
On Fig. 4.1, encircle the carboxylic acid functional group.
Feb/March 2025
Which of the compounds shown belong to the same homologous series?
May/June 2016
The diagram illustrates a molecule of the organic compound W. Which statement is incorrect?
May/June 2016
Which compound is not part of the same homologous series as the other three compounds?
May/June 2016
Which of the compounds listed below belong to the same homologous series? 1 $\text{CH}_3\text{OH}$ 2 $\text{CH}_3\text{CH}_2\text{OH}$ 3 $\text{CH}_3\text{COOH}$ 4 $\text{CH}_3\text{CH}_2\text{CH}_2\text{OH}$
May/June 2016
Which of the compounds listed below has matching numbers of carbon, hydrogen and oxygen atoms? W: ethyl methanoate X: methyl ethanoate Y: methyl methanoate Z: ethyl ethanoate
May/June 2016
Which compound does not belong to the same homologous series as the other three compounds?
May/June 2016
The six organic compounds are drawn below and labelled P, Q, R, S, T and U.
May/June 2016
Alkanes, alkenes and alcohols form three distinct homologous series of organic compounds.
May/June 2016
Diagrams of several carbon-containing substances are shown. The substances are labelled A, B, C, D and E.
May/June 2016
The molecular structures of three substances are shown. What makes all of these substances members of the same homologous series?
May/June 2017
The structures of three substances are shown. Why are all three substances part of the same homologous series?
May/June 2017
The structures of three substances are shown. What is the reason that these substances are all in the same homologous series?
May/June 2017
The diagram illustrates the structures of two organic molecules. Which statement about these molecules is incorrect?
May/June 2017
The diagram shows the structure of an ester. Which row is the correct one?
May/June 2017
Which statement concerning homologous series is incorrect?
May/June 2017
Butane and methylpropane are isomers with molecular formula $\text{C}_4\text{H}_{10}$. Which of the following statements are correct?
May/June 2017
The structure of an ester is shown. Which alcohol and carboxylic acid are used to make this ester?
May/June 2017
A diagram of the lactic acid structure is shown.
May/June 2017
Alkenes and alkanes are each homologous series of hydrocarbons.
May/June 2017
Name the homologous series whose names of organic compounds finish with -ene and -oic acid.
May/June 2017
The following four organic compounds are given: ethane, ethanoic acid, ethanol and ethene. Which type of bond is present in all four compounds?
May/June 2018
Three early members of a homologous series are shown. Why are these molecules classified as a homologous series?
May/June 2018
Which compounds are members of the same homologous series?
May/June 2018
Four organic compounds are given below. ethane ethanoic acid ethanol ethene Which bond is present in all four compounds?
May/June 2018
The displayed diagrams show the structures of several organic compounds. Which of these compounds are members of the same homologous series?
May/June 2018
Which esters possess the molecular formula $\text{C}_5\text{H}_{10}\text{O}_2$?
May/June 2018
A number of organic compounds, including alcohols, carboxylic acids and esters, are made up only of carbon, hydrogen and oxygen.
May/June 2018
Why does ethanol belong to the homologous series of alcohols whereas propane does not?
May/June 2019
How is ethanoic acid structured?
May/June 2019
Which of the following statements about homologous series is not correct?
May/June 2019
Which of the following statements about homologous series are correct?
May/June 2019
What feature means that ethanol belongs to the homologous series of alcohols, while propane does not?
May/June 2019
Which statement about homologous series is incorrect?
May/June 2019
The structures of four molecules are displayed. Which two molecules react with each other to produce the ester propyl methanoate?
May/June 2019
Which of these statements about homologous series are correct?
May/June 2019
A structure for compound S is shown.
May/June 2019
Methanol is produced industrially by reacting carbon monoxide with hydrogen. The gases are used at a temperature of 250 ^{\circ}C and a pressure of 75 atmospheres. $\text{CO(g)} + 2\text{H}_2\text{(g)} \rightleftharpoons \text{CH}_3\text{OH(g)}$ The forward reaction releases heat.
May/June 2019
The structure of an organic molecule is displayed. Which functional groups are present in this molecule?
May/June 2021
Which compounds are members of the same homologous series?
May/June 2021
Which compounds are members of the same homologous series?
May/June 2021
Which compounds are members of the same homologous series?
May/June 2021
Compound Z is made up of carbon, hydrogen and oxygen. Each molecule of compound Z contains two carbon atoms and four hydrogen atoms. It is produced by oxidising an alcohol. What is compound Z?
May/June 2021
Which of the following statements about homologous series and isomerism is correct?
May/June 2021
The diagrams display the structural formulae of four compounds. Which two compounds are structural isomers?
May/June 2021
The diagram of malic acid is shown.
May/June 2021
The structures of the two organic compounds, F and G, are shown.
May/June 2021
Organic compounds may consist only of carbon, hydrogen and oxygen.
May/June 2021
Which of the lists contains compounds that belong to the same homologous series?
May/June 2022
Compound J is an unsaturated carboxylic acid. Which types of bonds are found in a molecule of J?
May/June 2022
Some characteristics of colourless liquid L are given below. - It has a boiling point of $65\degree\text{C}$. - When it is added to water, it forms two layers that do not mix. - It shows no reaction with sodium carbonate. - It causes no change to bromine water. What is L?
May/June 2022
Some hydrocarbons are shown in structural form. Which statement about these hydrocarbons is correct?
May/June 2022
What kind of compound is produced when a protein is hydrolysed?
May/June 2022
The displayed structures of four organic compounds, B, C, D and E, are given.
May/June 2022
A section of the structure of a vitamin A molecule is shown. Which statements about this section of the structure are correct?
May/June 2023
Which row gives the general formula for alkenes and for alcohols?
May/June 2023
Compound Z possesses the molecular formula $\text{C}_2\text{H}_6\text{O}$. Which statement about compound Z is correct?
May/June 2023
The displayed formula of an organic compound is given. Which homologous series does this compound belong to?
May/June 2023
An alkene is shown by the formula $\text{CH}_3\text{CH}=\text{CH}_2$. What name is used for this kind of formula?
May/June 2023
Hydrocarbon P undergoes cracking to produce compound Q and hydrogen. Compound R is then made by addition polymerisation of compound Q. To which homologous series do P, Q and R belong?
May/June 2023
Which compounds are structural isomers?
May/June 2023
On Fig. 7.1, draw a circle around the functional group that makes compound E unsaturated.
May/June 2023
This question concerns organic compounds.
May/June 2023
The structures for four organic compounds are given. Which of the compounds are members of the same homologous series?
May/June 2024
The structures of four organic compounds, W, X, Y and Z, are shown. Which of these compounds belong to the same homologous series?
May/June 2024
State the empirical formula of ethanoic acid.
May/June 2024
The structural formulae for five compounds are shown below. 1 $\text{C}_4\text{H}_{10}$ 2 $\text{C}_2\text{H}_5\text{OH}$ 3 $\text{C}_4\text{H}_9\text{OH}$ 4 $\text{C}_4\text{H}_9\text{COOH}$ 5 $\text{C}_5\text{H}_{11}\text{OH}$ Which compounds belong to the same homologous series?
May/June 2024
Which statement about a homologous series is correct?
May/June 2024
A structure of glycine is shown. Which row gives the correct answer?
May/June 2024
Fig. 8.1 presents the displayed formulae for five organic compounds, V, W, X, Y and Z.
May/June 2024
A number of organic compounds are made up of carbon and hydrogen alone.
May/June 2024
Organic compounds may consist solely of carbon and hydrogen atoms.
May/June 2024
Which row shows compounds that belong to the same homologous series?
May/June 2025
The formulae of three organic compounds are given below. Which of these compounds are in the same homologous series?
May/June 2025