DP Chemistry (last assessment 2024)

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Question 19M.1.hl.TZ2.36

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1.hl.TZ2.36
Level hl Paper 1 Time zone TZ2
Command term Question number 36 Adapted from N/A
36.
[Maximum mark: 1]
19M.1.hl.TZ2.36

Which compound exists as two configurational isomers?

A. CBr2=CH2

B. CH2=CHBr

C. CHBr2CH2Br

D. CHBr=CHBr

[1]

Markscheme

D

Examiners report

71 % of the candidates identified 1,2-dibromoethene as having two configurational isomers. The most commonly chosen distractor was C which was the only saturated halogenoalkane, indicating that these candidates may have confused the term with “conformational” isomers.

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