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Date May 2017 Marks available 1 Reference code 17M.3.sl.TZ2.9
Level SL Paper 3 Time zone TZ2
Command term Identify Question number 9 Adapted from N/A

Question

A chemical reaction occurs when a phospholipid is heated with excess sodium hydroxide.

Glycerol is one product of the reaction. Identify the two other organic products.

[2]
a.

Identify the type of reaction which occurs.

[1]
b.

Markscheme

C17H31COONa 

[(CH3)3NCH2CH2OH]OH

 

Accept “NaC17H31COO”.

Accept “(CH3)3N+CH2CH2OH OR [(CH3)3NCH2CH2OH]+” if positive charge is shown.

Accept suitable names (eg, sodium linoleate, choline hydroxide etc.) OR correct molecular formulas.

[2 marks]

a.

hydrolysis

 

Accept “nucleophilic substitution/displacement / SN/SN2 /saponification”.

Do not accept “acid hydrolysis”.

[1 mark]

b.

Examiners report

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

Syllabus sections

Options » B: Biochemistry » B.1 Introduction to biochemistry
Options » B: Biochemistry » B.3 Lipids
Options » B: Biochemistry
Options

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