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Date November 2018 Marks available 1 Reference code 18N.2.hl.TZ0.2
Level HL Paper 2 Time zone TZ0
Command term Deduce Question number 2 Adapted from N/A

Question

An organic compound containing carbon, hydrogen and oxygen has 62.02 % carbon and 10.43 % hydrogen by mass.

Determine the empirical formula of the compound, showing your working.

[3]
a.

The infrared spectrum of the compound is shown. Deduce the functional group of the compound.

[1]
b.

The mass spectrum of the compound is shown. Deduce the relative molecular mass of the compound.

[1]
c.

The compound could not be oxidized using acidifi ed potassium dichromate(VI).

Deduce the structural formula of the compound.

[1]
d.

Markscheme

«in 100 g sample»  62.02 g 12.01 g mo l 1 AND  10.43 g 1.01 g mo l 1

OR

«in 100 g sample» 5.164 mol C AND 10.33 mol H ✔

 

27.55 %

OR

1.722 mol O ✔

 

«empirical formula» C3H6O ✔

a.

«absorption at wavenumber 1700−1750 cm–1» C=O/carbonyl ✔

 

Do not accept “ketone” or “aldehyde”.

b.

«m/z =» 58 ✔

c.

d.

Examiners report

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

Syllabus sections

Core » Topic 10: Organic chemistry » 10.1 Fundamentals of organic chemistry
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