Alkanes

If one mole of a compound, $X$, is cracked, it gives one mole of propene and one mole of hydrogen. $X \rightarrow \text{C}_3\text{H}_6 + \text{H}_2$. What type of compound is $X$?

May/June 2015

Which of the following statements about alkanes is correct?

May/June 2015

If one mole of the compound, $X$, is cracked, it gives one mole of propene and one mole of hydrogen. $X \rightarrow \text{C}_3\text{H}_6 + \text{H}_2$ What class of compound is $X$?

May/June 2015

Which statement concerning the properties of the four alkanes from methane through butane is incorrect?

May/June 2015

Alkanes form a homologous series of saturated hydrocarbons. The table gives information about several alkanes.

May/June 2015

When 1 mole of methane reacts with a large excess of chlorine in sunlight, how many moles of hydrogen chloride are formed?

May/June 2016

Which statement concerning alkanes is correct?

May/June 2016

What description best fits the following reaction? $\text{C}_8\text{H}_{18} \rightarrow \text{C}_4\text{H}_{10} + 2\text{C}_2\text{H}_4$

May/June 2016

Cyclohexane, C$_6$H$_{12}$, is one of the cycloalkanes.

May/June 2016

Which of these statements about pure hexane, $\text{C}_6\text{H}_{14}$, is correct?

May/June 2017

Each alkane is completely burnt when one mole is used. Which alkane gives seven moles of products?

May/June 2017

When one mole of each alkane is completely combusted, which alkane produces seven moles of products?

May/June 2017

Which compound is present in petroleum (crude oil)?

May/June 2018

Which formula is that of an alkane?

May/June 2018

If 1 volume of gas R reacts with exactly 5 volumes of oxygen, only carbon dioxide and water are produced. Which gas is R?

May/June 2018

Which diagram represents a branched-chain isomer of butane?

May/June 2018

Methylpropane is a saturated hydrocarbon, and its structure is shown.

May/June 2018

Naphtha is one fraction separated from petroleum (crude oil).

May/June 2018

Compound Q is a hydrocarbon with no isomers. In the dark, compound Q does not decolourise bromine. Which compound could be Q?

May/June 2019

When a molecule of a saturated hydrocarbon is cracked, it produces two molecules, X and Y. Which row is correct?

May/June 2019

A molecule of compound Q contains only three C-C single bonds and ten C-H bonds, with no additional bonds present. Which statement about compound Q is correct?

May/June 2019

How many moles of hydrogen chloride are produced when one mole of methane reacts with a large excess of chlorine in sunlight?

May/June 2021

How many moles of hydrogen chloride are produced when 1 mole of methane reacts with a large excess of chlorine in sunlight?

May/June 2021

Alkanes form a homologous series of saturated hydrocarbons.

May/June 2022

Which equation represents the reaction between ethane and chlorine when ultraviolet light is present?

May/June 2023

Which statement about ethane is true?

May/June 2023

Alkanes are saturated compounds made up of carbon and hydrogen only. Structures $1$, $2$, $3$ and $4$ are saturated hydrocarbons. Which pair of structures are isomers?

May/June 2024

Compound Q is a hydrocarbon for which no structural isomers exist. When kept in the dark, Compound Q does not cause bromine to decolourise. Which compound could Q be?

May/June 2024

Which of these equations show the reactions of alkanes?

May/June 2024

Which equation shows a substitution reaction?

May/June 2024

Aluminium carbide, $\text{Al}_4\text{C}_3$, reacts with water to produce methane, $\text{CH}_4$, and aluminium hydroxide.

May/June 2024

Three statements about alkanes are given. Which of the statements are correct?

May/June 2025

Alkanes take part in a substitution reaction with chlorine. Which row identifies two statements that are correct about the reaction of alkanes with chlorine?

May/June 2025

Fig. 3.1 displays the equation for the reaction of methane with chlorine. In Fig. 3.1, methane reacts with chlorine to produce chloromethane and hydrogen chloride. Table 3.1 gives some bond energies.

May/June 2025

Which diagram represents an isomer of butane?

Oct/Nov 2015

A hydrocarbon that is unsaturated and has six carbon atoms contains only three C=C double bonds. This hydrocarbon is then reacted with excess hydrogen at a high temperature. What is the formula of the hydrocarbon formed?

Oct/Nov 2016

Compound Q is represented by the formula $\text{C}_4\text{H}_{10}$. Which statement concerning compound Q is correct?

Oct/Nov 2016

Hydrocarbons in the alkane family form a homologous series.

Oct/Nov 2016

Compounds S and T each consist of only two elements. They show the following characteristics. • When burned in air, both produce only carbon dioxide and water. • Both undergo substitution with chlorine. • The boiling point of S is higher than that of T. What might compounds S and T be?

Oct/Nov 2017

The diagrams illustrate the structures of five hydrocarbons. Which three hydrocarbons are isomers of one another?

Oct/Nov 2017

When hydrocarbons burn completely, they produce carbon dioxide and water.

Oct/Nov 2017

How many of the molecules shown are members of the homologous series of alkanes? $\text{C}_2\text{H}_4$, $\text{C}_3\text{H}_8$, $\text{C}_4\text{H}_{10}$, $\text{C}_5\text{H}_{10}$, $\text{C}_6\text{H}_{14}$

Oct/Nov 2018

Which statement concerning the homologous series of alkanes is correct?

Oct/Nov 2018

The alkanes form a homologous series made up of saturated hydrocarbons.

Oct/Nov 2018

Alkanes are saturated compounds that contain only carbon and hydrogen. Structures 1, 2, 3 and 4 are saturated hydrocarbons. Among structures 1, 2, 3 and 4, which pair of structures are isomers?

Oct/Nov 2019

Alkanes are saturated compounds that contain only carbon and hydrogen. Structures 1, 2, 3 and 4 are saturated hydrocarbons. Identify the pair of structures that are isomers.

Oct/Nov 2019

A reaction takes place between chlorine and methane. Which row is the correct one?

Oct/Nov 2020

When propane is combined with chlorine gas in ultraviolet light, substitution reactions take place. Which compound could be produced when propane and chlorine are combined in ultraviolet light?

Oct/Nov 2020

Which statement concerning alkanes is correct?

Oct/Nov 2021

Alkanes form a homologous series of hydrocarbons. As the number of carbon atoms goes up, the boiling point, melting point and density of alkanes also rise.

Oct/Nov 2021

The apparatus is used by a student to separate a mixture containing three alkanes.

Oct/Nov 2021

Octane is an alkane that has eight carbon atoms in each molecule. What is the molecular formula for octane, and how does its boiling point compare with that of butane?

Oct/Nov 2022

Which equation correctly shows the reaction between propane and chlorine?

Oct/Nov 2022

Which compound can be classified as an alkane?

Oct/Nov 2022

The alkanes belong to a homologous series of hydrocarbons.

Oct/Nov 2022

When $20\,\text{cm}^3$ of a gaseous alkane, X, undergoes complete combustion, $130\,\text{cm}^3$ of oxygen is needed. Both volumes are taken at r.t.p. What could X be?

Oct/Nov 2023

An incomplete equation for the reaction between propane and chlorine is shown. $\text{C}_3\text{H}_8 + \text{Cl}_2 \rightarrow \text{C}_3\text{H}_7\text{Cl} + X$ A student gives three statements about this reaction. 1 The activation energy for this reaction is provided by ultraviolet light. 2 $\text{C}_3\text{H}_7\text{Cl}$ has two different structural formulae. 3 $X$ is an acidic gas. Which of the statements are correct?

Oct/Nov 2023

Alkenes may be obtained by cracking alkanes, for example decane, $\text{C}_{10}\text{H}_{22}$. Which equation represents the cracking of decane to form two different alkenes and at least one additional product?

Oct/Nov 2024

P is a branched hydrocarbon in which the ratio of carbon atoms to hydrogen atoms is $1:2$. P has a relative molecular mass of $56$. What compound is P?

Oct/Nov 2025

Which equation shows the reaction between ethane and chlorine when ultraviolet light is present?

Oct/Nov 2025

Which statement regarding alkanes is correct?

Oct/Nov 2025