DP Chemistry (last assessment 2024)

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Question 19M.2.sl.TZ1.c(ii)

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.sl.TZ1.c(ii)
Level sl Paper 2 Time zone TZ1
Command term Draw Question number c(ii) Adapted from N/A
c(ii).
[Maximum mark: 2]
19M.2.sl.TZ1.c(ii)

Xylene is a derivative of benzene. One isomer is 1,4-dimethylbenzene.

Bromine reacts with alkanes.

1,4-dimethylbenzene reacts as a substituted alkane. Draw the structures of the two products of the overall reaction when one molecule of bromine reacts with one molecule of 1,4-dimethylbenzene.

[2]

Markscheme

  [✔]

HBr  [✔]

 

Note: Accept condensed formulae, such as CH3C6H4CH2Br.

Accept skeletal structures.

Examiners report

Very few students gained 2 marks finding hard to apply their knowledge of free radical substitution to a benzene containing compound. Many thought that the bromine will attach to the benzene ring or would substitute the alkyl group twice and not produce HBr.

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