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Edexcel IGCSE Chemistry (c) Alkanes Question Bank

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

(c) Alkanes 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 ]

(c) Alkanes 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.
condition

[ 2 ]
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