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Date November 2010 Marks available 2 Reference code 10N.3.hl.TZ0.F5
Level HL Paper 3 Time zone TZ0
Command term Predict and State Question number F5 Adapted from N/A

Question

The structure below shows –(l)-carvone.

N10/4/CHEMI/HP3/ENG/TZ0/F5

–(l)-carvone has another optical isomer.

State its name and, by means of a diagram, predict its structure.

[2]
a.

Describe the structural feature of the carvone molecule that allows it to exist as optical isomers.

[1]
b.

Markscheme

Name:

+(d)-carvone/s-carvone/(+)-(S)-carvone / dextro-carvone;

Structure:

N10/4/CHEMI/HP3/ENG/TZ0/F5.a/M ;

a.

asymmetric/chiral carbon / OWTTE;

b.

Examiners report

This question was reasonably well answered.

a.

This question was reasonably well answered

b.

Syllabus sections

Additional higher level (AHL) » Topic 20: Organic chemistry » 20.3 Stereoisomerism
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