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Date November 2016 Marks available 3 Reference code 16N.2.hl.TZ0.5
Level HL Paper 2 Time zone TZ0
Command term Construct Question number 5 Adapted from N/A

Question

Propane and propene are members of different homologous series.

(i) Draw diagrams to show how sigma (σ) and pi (π) bonds are formed between atoms.

 

(ii) State the number of sigma (σ) and pi (π) bonds in propane and propene.

[4]
b.

Construct the mechanism of the formation of 2-bromopropane from hydrogen bromide and propene using curly arrows to denote the movement of electrons.

[3]
d.

Markscheme

i

 

ii

Award [1] for two or three correct answers.
Award [2] for all four correct.

b.

curly arrow going from C=C to H of HBr and curly arrow showing Br leaving
representation of carbocation
curly arrow going from lone pair/negative charge on Br to C+

Award [2 max] for formation of 1-bromopropane.

d.

Examiners report

[N/A]
b.
[N/A]
d.

Syllabus sections

Additional higher level (AHL) » Topic 20: Organic chemistry » 20.1 Types of organic reactions
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Additional higher level (AHL) » Topic 20: Organic chemistry
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