DP Chemistry (last assessment 2024)

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Question 18N.2.hl.TZ0.2

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Date November 2018 Marks available [Maximum mark: 6] Reference code 18N.2.hl.TZ0.2
Level hl Paper 2 Time zone TZ0
Command term Deduce, Determine Question number 2 Adapted from N/A
2.
[Maximum mark: 6]
18N.2.hl.TZ0.2

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

(a)

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

[3]

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 ✔

(b)

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

[1]

Markscheme

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

 

Do not accept “ketone” or “aldehyde”.

(c)

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

[1]

Markscheme

«m/z =» 58 ✔

(d)

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

Deduce the structural formula of the compound.

[1]

Markscheme

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