DP Chemistry (first assessment 2025)

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Question 23M.2.HL.TZ1.7

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Date May 2023 Marks available [Maximum mark: 2] Reference code 23M.2.HL.TZ1.7
Level HL Paper 2 Time zone TZ1
Command term Deduce, Outline Question number 7 Adapted from N/A
7.
[Maximum mark: 2]
23M.2.HL.TZ1.7

The structural formulae of two esters of formula C3H6O2 are shown.

(a.i)

Deduce the number of signals you would expect to find in the 1H NMR spectrum of each compound.

[1]

Markscheme
 Name  Number of signals
 Ethyl methanoate  3
 Methyl ethanoate  AND 2

 ✓

(a.ii)

Outline why infrared spectroscopy is not used to differentiate between the two esters.

[1]

Markscheme

same types of bonds «present in both molecules»
OR
same wavenumbers absorbed ✓