DP Chemistry (last assessment 2024)

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Question 18M.2.sl.TZ1.c

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.2.sl.TZ1.c
Level sl Paper 2 Time zone TZ1
Command term State Question number c Adapted from N/A
c.
[Maximum mark: 1]
18M.2.sl.TZ1.c

This question is about ethene, C2H4, and ethyne, C2H2.

One possible Lewis structure for benzene is shown.

                                                         M18/4/CHEMI/SP2/ENG/TZ1/03.c

State one piece of physical evidence that this structure is incorrect.

[1]

Markscheme

equal C–C bond «lengths/strengths»

OR

regular hexagon

OR

«all» C–C have» bond order of 1.5

OR

«all» C–C intermediate between single and double bonds

 

Accept “all C–C–C bond angles are equal”.

[1 mark]

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