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Date May 2017 Marks available 2 Reference code 17M.2.sl.TZ1.6
Level SL Paper 2 Time zone TZ1
Command term Discuss Question number 6 Adapted from N/A

Question

Benzene is an aromatic hydrocarbon.

Discuss the physical evidence for the structure of benzene.

[2]
a.

State the typical reactions that benzene and cyclohexene undergo with bromine.

[1]
b.

Markscheme

Any two of:

planar «X-ray»

C to C bond lengths all equal
OR
C to C bonds intermediate in length between C–C and C=C

all C–C–C bond angles equal

 

Accept all C to C bonds have same bond strength/bond energy.

[2 marks]

a.

benzene: «electrophilic» substitution/SE
AND
cyclohexene: «electrophilic» addition/AE

 

Accept correct equations.

[1 mark]

b.

Examiners report

[N/A]
a.
[N/A]
b.

Syllabus sections

Core » Topic 10: Organic chemistry » 10.1 Fundamentals of organic chemistry
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Core » Topic 10: Organic chemistry » 10.2 Functional group chemistry
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