DP Chemistry (last assessment 2024)

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Question 22M.1.sl.TZ2.28

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1.sl.TZ2.28
Level sl Paper 1 Time zone TZ2
Command term Deduce Question number 28 Adapted from N/A
28.
[Maximum mark: 1]
22M.1.sl.TZ2.28

How many signals are observed in the 1H NMR spectrum of this compound?

A.  1

B.  2

C.  3

D.  4

[1]

Markscheme

A

Examiners report

The compound used for this 1H NMR question was unfamiliar to the candidates and it was a skeletal formula. They were expected to notice its symmetry and that all H’s had the same chemical environment. The majority of candidates saw only part of this symmetry and decided on two chemical environments. 29% of the candidates obtained the correct answer. Some teachers commented on the difficulty of this question.

Syllabus sections