Alkanes

Which of the compounds listed are alkanes? Compound W: $\text{C}_4\text{H}_{10}$ Compound X: $\text{C}_5\text{H}_{10}$ Compound Y: $\text{C}_6\text{H}_{12}$ Compound Z: $\text{C}_6\text{H}_{14}$

Feb/March 2016

Hydrocarbons that burn in car engines react with air to produce a blend of gases. The table gives the proportions of the gases in the mixture leaving a car exhaust.

Feb/March 2017

This question concerns alkanes and petroleum fractions.

Feb/March 2019

Propane reacts with chlorine. Which row gives a condition needed for this reaction and identifies the type of reaction?

Feb/March 2021

When one mole of alkane Y is completely burned in excess oxygen, it gives $72\,\text{dm}^3$ of carbon dioxide, measured at room temperature and pressure. What is Y?

Feb/March 2023

Methane and chlorine combine to make chloromethane. Which row gives the required reaction conditions and the reaction type?

Feb/March 2024

Methyl propane has the structural formula $\text{CH}_3\text{CH}(\text{CH}_3)\text{CH}_3$. The equation shows methyl propane reacting with chlorine. $\text{C}_4\text{H}_{10} + \text{Cl}_2 \rightarrow \text{C}_4\text{H}_9\text{Cl} + \text{HCl}$. From this reaction, how many structural isomers with molecular formula $\text{C}_4\text{H}_9\text{Cl}$ can be produced?

Feb/March 2025

Which compound does not belong to the alkane series, $\text{C}_n\text{H}_{2n+2}$?

May/June 2016

Which of the following statements about methane is incorrect?

May/June 2016

Which compound is not a member of the alkane series, $\text{C}_n\text{H}_{2n+2}$?

May/June 2016

By which process are alkenes produced from alkanes?

May/June 2017

Citronellol occurs in rose oil, and its structure is shown here.

May/June 2017

Cyclopropane is a colourless gas, and it reacts with bromine at room temperature, as shown by the equation below. cyclopropane + bromine → dibromopropane

May/June 2017

Gasoline acts as fuel for cars, and it is made up of a mixture of hydrocarbons.

May/June 2017

What substances are produced when hydrocarbons are cracked?

May/June 2018

What substances can be produced by cracking hydrocarbons?

May/June 2018

Methane, ethane and propane are members of a hydrocarbon family known as alkanes. What is the general formula for an alkane?

May/June 2018

Which compounds can be produced by cracking hydrocarbons?

May/June 2018

The table gives the volume percentage for each gas present in the exhaust gases from a petrol engine.

May/June 2018

Chlorine reacts with methane. Which of the statements below are correct?

May/June 2019

Under bright sunlight, ethane and chlorine undergo substitution reactions. Which compound is not produced in these reactions?

May/June 2019

What kind of reaction occurs when methane reacts with chlorine in the presence of ultraviolet light?

May/June 2019

Methane, ethane and ethene are all hydrocarbons.

May/June 2019

Which of these statements about alkanes is correct?

May/June 2021

Which of the following statements about alkanes is correct?

May/June 2021

Which statement regarding alkanes is correct?

May/June 2021

P, Q, R and S are organic compounds. P is produced when ethene reacts with steam. Q causes bromine water to lose its colour. R is a hydrocarbon; every bond in it is a single covalent bond. S is a waste product formed during digestion in animals. Which compounds are alkanes?

May/June 2021

Which of the following statements about alkanes is correct?

May/June 2021

Which pair of formulae shows two alkanes?

May/June 2021

Which statement about alkanes is correct?

May/June 2021

Which of the following statements about alkanes is correct?

May/June 2021

Several characteristics of colourless liquid L are given below. • It has a boiling point of $65^{\circ}\text{C}$. • If it is added to water, two separate layers are seen that do not mix. • It does not react when sodium carbonate is added. • It shows no change with bromine water. What is L?

May/June 2022

Which statement gives the correct description of cracking?

May/June 2022

Ethane reacts with chlorine under ultraviolet light. Which substances are formed in the reaction?

May/June 2022

The reaction equation for butane, $\text{C}_4\text{H}_{10}$, with chlorine is given below. $\text{C}_4\text{H}_{10} + \text{Cl}_2 \rightarrow \text{C}_4\text{H}_9\text{Cl} + \text{HCl}$ What kind of reaction takes place when butane reacts with chlorine?

May/June 2022

The hydrocarbon $\text{C}_{12}\text{H}_{26}$ undergoes cracking to produce X and Y, as indicated. $\text{C}_{12}\text{H}_{26} \rightarrow X + Y$ Which of the following statements is correct?

May/June 2022

Which equation illustrates the cracking of an alkane?

May/June 2023

The displayed structural formulae represent two hydrocarbons. $\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_3$  $\text{CH}_3\text{CH}(\text{CH}_3)\text{CH}_3$ Which of the following statements about these hydrocarbons is correct?

May/June 2023

Which equation shows the cracking of an alkane?

May/June 2023

Alkanes take part in substitution reactions when UV light is present. Which equation shows a substitution reaction involving ethane?

May/June 2023

Chlorine and methane undergo substitution reactions. During these reactions, how many distinct products with a single carbon atom can be formed?

May/June 2023

When ultraviolet radiation is present, butane reacts with chlorine. What equation represents this reaction?

May/June 2023

Propane and propene both undergo reaction with chlorine.

May/June 2023

Which formula shows a compound belonging to the homologous series of alkanes?

May/June 2024

Which of the following statements about ethane is correct?

May/June 2024

Propane reacts with chlorine. Which of the following statements about this reaction are correct?

May/June 2024

Which structures show a pair of structural isomers? 1. $\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{CH}_2\text{CH}_3$ 2. $\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{CH}(\text{CH}_3)_2$ 3. $\text{CH}_3\text{CH}(\text{CH}_3)\text{CH}_2\text{CH}_2\text{CH}_3$ 4. $\text{CH}_3\text{CH}(\text{CH}_3)\text{CH}_2\text{CH}_2\text{CH}_3$

May/June 2024

Alkanes belong to a homologous series of hydrocarbons. The table lists the names and boiling points of the first four members in this series. Pentane is the next member in the series. Which row shows the molecular formula and boiling point of pentane?

May/June 2024

Methane reacts with chlorine by substitution and also undergoes complete combustion in excess oxygen. Which row correctly describes these two reactions?

May/June 2024

This question concerns hydrocarbons.

May/June 2024

Compound Z has the molecular formula $\text{C}_4\text{H}_{10}$. Which row shows the substance that reacts with Z and states the reaction type that takes place?

May/June 2025

Three statements about the cracking of larger alkane molecules are given. Which statements are correct?

May/June 2025

Which of these statements concerning the alkanes are correct?

May/June 2025

Which products may result from cracking one molecule of hexane, $\text{C}_6\text{H}_{14}$?

May/June 2025

In one molecule of propane, what is the overall number of covalent bonds?

May/June 2025

Ethane reacts with chlorine when ultraviolet light is present. Which products are produced?

May/June 2025

Compound W is a hydrocarbon containing only single bonds. Which homologous series does W belong to?

May/June 2025

In a photochemical reaction, methane reacts in ultraviolet light to make chloromethane. Which statement about this reaction is correct?

May/June 2025

Butane reacts as shown: $\text{butane} \xrightarrow[\text{and heat}]{\text{catalyst}} \text{butene} + \text{hydrogen}$. What kind of reaction is this?

Oct/Nov 2016

Which statement cannot be correct for an alkane?

Oct/Nov 2016

Butane changes in the way shown below. $\text{butane} \xrightarrow[\text{and heat}]{\text{catalyst}} \text{butene} + \text{hydrogen}$ What kind of reaction is this?

Oct/Nov 2016

Butane changes according to the equation below. butane $\xrightarrow{\text{catalyst and heat}}$ butene + hydrogen What kind of reaction is this?

Oct/Nov 2016

Butane undergoes the reaction shown below. butane $\xrightarrow[\text{and heat}]{\text{catalyst}}$ butene + hydrogen What kind of reaction is this?

Oct/Nov 2016

Several organic molecule structures are displayed. Which of the structures are alkanes containing four carbon atoms?

Oct/Nov 2017

The diagram illustrates a reaction pathway. butane $\xrightarrow{X}$ ethene $\xrightarrow{Y}$ ethanol $\xrightarrow{Z}$ carbon dioxide and water Which row correctly gives the names of the processes X, Y and Z?

Oct/Nov 2017

Which equation shows the complete combustion of butane, $\text{C}_4\text{H}_{10}$?

Oct/Nov 2017

The diagram illustrates a reaction pathway: butane $\rightarrow$ ethene $\rightarrow$ ethanol $\rightarrow$ carbon dioxide and water Which row gives the names of processes X, Y and Z?

Oct/Nov 2017

The diagram illustrates a reaction pathway: $\text{butane} \xrightarrow{X} \text{ethene} \xrightarrow{Y} \text{ethanol} \xrightarrow{Z} \text{carbon dioxide and water}$ Which row gives the names of the processes X, Y and Z?

Oct/Nov 2017

Some organic molecules are displayed as structures. Which of the structures shows an alkane containing four carbon atoms?

Oct/Nov 2017

The diagram below outlines a reaction pathway. $\text{butane} \xrightarrow{X} \text{ethene} \xrightarrow{Y} \text{ethanol} \xrightarrow{Z} \text{carbon dioxide and water}$ Which row gives the names of processes X, Y and Z?

Oct/Nov 2017

The diagram illustrates a series of reactions. butane $\xrightarrow{X}$ ethene $\xrightarrow{Y}$ ethanol $\xrightarrow{Z}$ carbon dioxide and water Which row identifies the processes X, Y and Z?

Oct/Nov 2017

Which equation for a methane reaction is correct?

Oct/Nov 2018

Which equation for a reaction of methane is correct?

Oct/Nov 2018

Which equation shows the incomplete combustion of propane, $\text{C}_3\text{H}_8$?

Oct/Nov 2018

Which equation for a reaction of methane is correct?

Oct/Nov 2018

What products are produced when an alkane undergoes cracking?

Oct/Nov 2019

Which of the following statements about ethane is correct?

Oct/Nov 2019

What products are produced when an alkane is cracked?

Oct/Nov 2019

What products are produced when an alkane is cracked?

Oct/Nov 2019

What products are formed when an alkane is cracked?

Oct/Nov 2019

Which products are formed when an alkane is cracked?

Oct/Nov 2019

What products are produced when an alkane is cracked?

Oct/Nov 2019

Which statement gives a description of methane?

Oct/Nov 2020

Which chemical equation correctly shows the substitution of an alkane by chlorine?

Oct/Nov 2020

Ethane belongs to the alkane family.

Oct/Nov 2020

Ethane, propane and butane belong to one homologous series.

Oct/Nov 2020

A molecule of an alkane with molecular formula $\text{C}_8\text{H}_{18}$ is cracked. The reaction equation is given as $\text{C}_8\text{H}_{18} \rightarrow Q + 2R$. Substance R contains two carbon atoms in each molecule and turns aqueous bromine colourless. What is substance Q?

Oct/Nov 2021

When alkanes react with chlorine, chloroalkanes are produced. Which statement about alkane reactions with chlorine is correct?

Oct/Nov 2021

A large hydrocarbon is cracked. The only two products are a smaller hydrocarbon, X, and a gas. Which row names hydrocarbon X and the gas?

Oct/Nov 2022

In ultraviolet light, methane reacts with chlorine. Which substance is not made in this reaction?

Oct/Nov 2022

The reaction equation for methane with chlorine is given below. $\text{CH}_4 + 4\text{Cl}_2 \rightarrow \text{CCl}_4 + 4\text{HCl}$ What kind of reaction does methane undergo?

Oct/Nov 2022

Seven compounds, A, B, C, D, E, F and G, are illustrated. A: methane structure (carbon with four hydrogens) B: sulfur dioxide structure O=S=O C: ethene structure H2C=CH2 D: propanoic acid structure E: ethanol structure F: propane structure G: carbon dioxide structure O=C=O Use these structures to answer the questions that follow. Any structure may be selected once, more than once, or not selected at all.

Oct/Nov 2022

Ethane, an alkane, reacts with chlorine in a photochemical reaction, as shown. $\text{C}_2\text{H}_6\text{(g)} + \text{Cl}_2\text{(g)} \rightarrow \text{C}_2\text{H}_5\text{Cl(l)} + \text{HCl(g)}$

Oct/Nov 2022

Which of the following statements about alkanes is correct?

Oct/Nov 2023

The four reaction types are given here. 1 substitution 2 combustion 3 polymerisation 4 addition Which of these reactions can ethane undergo?

Oct/Nov 2023

When a mixture of methane and chlorine is exposed to ultraviolet light, a reaction occurs. Which of the following statements about this reaction are correct?

Oct/Nov 2023

Propane reacts with chlorine in a substitution reaction. What reaction condition must be present for this reaction to take place?

Oct/Nov 2023

Methane undergoes reaction with chlorine in sunlight. $\text{CH}_4 + \text{Cl}_2 \rightarrow \text{CH}_3\text{Cl} + \text{HCl}$ Which of the statements below about this reaction are correct?

Oct/Nov 2023

In the presence of ultraviolet light, alkanes take part in substitution reactions with chlorine. Which equation represents a reaction of this kind?

Oct/Nov 2024

Which of the following statements about methane is correct?

Oct/Nov 2024