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Date	November 2016	Marks available	1	Reference code	16N.2.sl.TZ0.5
Level	SL	Paper	2	Time zone	TZ0
Command term	Draw	Question number	5	Adapted from	N/A

Question

Propane and propene are members of different homologous series.

Draw the full structural formulas of propane and propene.

[1]

Both propane and propene react with bromine.

(i) State an equation and the condition required for the reaction of 1 mol of propane with 1 mol of bromine.

(ii) State an equation for the reaction of 1 mol of propene with 1 mol of bromine.

(iii) State the type of each reaction with bromine.

Propane:

Propene:

[4]

Markscheme

Propane:

AND
Propene:

C₃H₈ + Br₂ → C₃H₇Br + HBr

«sun»light/UV/hv
OR
high temperature

Do not accept “reflux” for M2.

C₃H₆ + Br₂ → C₃H₆Br₂

iii

Propane: «free radical» substitution / S_RAND
Propene: «electrophilic» addition / A_EAward mark even if incorrect type of substitution/ addition given.

Examiners report

[N/A]

Syllabus sections

Core » Topic 10: Organic chemistry » 10.1 Fundamentals of organic chemistry

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