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Date May 2021 Marks available 1 Reference code 21M.2.sl.TZ1.5
Level SL Paper 2 Time zone TZ1
Command term Justify Question number 5 Adapted from N/A

Question

Ethanol is obtained by the hydration of ethene, C2H4.

State the class of compound to which ethene belongs.

[1]
a(i).

State the molecular formula of the next member of the homologous series to which ethene belongs.

[1]
a(ii).

Justify why ethene has only a single signal in its 1H NMR spectrum.

[1]
b.

Suggest two possible products of the incomplete combustion of ethene that would not be formed by complete combustion.

[1]
c.

A white solid was formed when ethene was subjected to high pressure.

Deduce the type of reaction that occurred.

[1]
d.

Markscheme

alkene ✔

a(i).

C3H6

Accept structural formula.

a(ii).

hydrogen atoms/protons in same chemical environment ✔

Accept “all H atoms/protons are equivalent”.
Accept “symmetrical”

b.

carbon monoxide/CO AND carbon/C/soot ✔

c.

«addition» polymerization ✔

d.

Examiners report

[N/A]
a(i).
[N/A]
a(ii).
[N/A]
b.
[N/A]
c.
[N/A]
d.

Syllabus sections

Core » Topic 11: Measurement and data processing » 11.3 Spectroscopic identification of organic compounds
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