DP Chemistry (last assessment 2024)

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Question 19M.2.hl.TZ2.c(v)

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.hl.TZ2.c(v)
Level hl Paper 2 Time zone TZ2
Command term Deduce Question number c(v) Adapted from N/A
c(v).
[Maximum mark: 2]
19M.2.hl.TZ2.c(v)

Ethyne, C2H2, reacts with oxygen in welding torches.

Ethyne reacts with steam.

C2H2 (g) + H2O (g) → C2H4O (g)

Two possible products are:

Deduce the splitting pattern you would expect for the signals in a high resolution 1H NMR spectrum.

2.3 ppm:

9.8 ppm:

[2]

Markscheme

2.3 ppm: doublet    [✔]

9.8 ppm: quartet    [✔]

Examiners report

The stronger candidates were able to predict the splitting pattern correctly, others inverted the answer, but many others repeated the information for protons with the given chemical shift, which is unexpected since wording was straightforward.

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