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Edexcel IGCSE Chemistry C Alkanes Questions

Practise recognising alkane formulae, saturation and substitution reactions using molecular formulae, equations and UV conditions.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • use CnH2n+2 to select or determine alkane molecular formulae from given options or data
  • explain saturation by linking hydrocarbons to C and H atoms with only single bonds
  • complete bromine substitution equations and give UV light as the essential condition

Covered syllabus points

4.19 Alkane general formula4.20 Saturated hydrocarbons4.21 Alkane structures and isomers4.22 Alkane substitution with halogens

Question 1

[Maximum number: 2]

Crude oil is a mixture of hydrocarbons.

Question (a)

(a)

One of the hydrocarbons in the refinery gas fraction is an alkane with the structural formula CH3CH2CH2CH3\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}

[ 1 ]

Question (i)

(i)

Give the name of this alkane.

[ 1 ]

Question (b)

(b)

One of the alkanes in the gasoline fraction has the displayed formula

Figure for Question (b) — Edexcel IGCSE Chemistry
[ 1 ]

Question (i)

(i)

Give the general formula for the alkanes.

[ 1 ]

Question 2

[Maximum number: 3]

This question is about alkanes and alkenes.

Question (a)

(a)

Ethane and ethene each react with bromine, but under different conditions.

[ 3 ]

Question (i)

(i)

Give a reason why ethane does not undergo an addition reaction with bromine.

[ 1 ]

Question (ii)

(ii)

Complete the equation for the substitution reaction between ethane and bromine, including an essential condition for the reaction.

C2H6+Br2→......+......C_2H_6 + Br_2 \rightarrow \text{......} + \text{......}
condition ......\text{......}

[ 2 ]

Question 3

[Maximum number: 2]

The table shows the structures of six organic compounds.

Table for Question 3 — Edexcel IGCSE Chemistry

Question (a)

(a)

Give the letter of a saturated compound with the general formula CnH2n\mathrm{C}_{\mathrm{n}} \mathrm{H}_{2 \mathrm{n}}

[ 1 ]

Question (b)

(b)

Compound F reacts with bromine in the presence of ultraviolet radiation.

[ 1 ]

Question (i)

(i)

Complete the equation for the reaction.

CH4+Br2→\mathrm{CH}_{4}+\mathrm{Br}_{2} \rightarrow
[ 1 ]

Question 4

[Maximum number: 1]

Crude oil is a mixture of hydrocarbons.

One of the alkanes in the gasoline fraction has the displayed formula

Figure for Question 4 — Edexcel IGCSE Chemistry

Give the general formula for the alkanes.

Question 5

[Maximum number: 1]

This question is about alkanes and alkenes.

Ethane and ethene each react with bromine, but under different conditions.

Give a reason why ethane does not undergo an addition reaction with bromine.

Question 6

[Maximum number: 1]

Crude oil is a mixture of hydrocarbons.

One of the hydrocarbons in the refinery gas fraction is an alkane with the structural formula CH3CH2CH2CH3\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}

Give the name of this alkane.

Question 7

[Maximum number: 1]

The table shows the structures of six organic compounds.

Table for Question 7 — Edexcel IGCSE Chemistry

Compound F reacts with bromine in the presence of ultraviolet radiation.

Complete the equation for the reaction.

CH4+Br2→\mathrm{CH}_{4}+\mathrm{Br}_{2} \rightarrow
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