DP Chemistry (last assessment 2024)
Question 18M.2.hl.TZ1.d
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.2.hl.TZ1.d |
| Level | hl | Paper | 2 | Time zone | TZ1 |
| Command term | State | Question number | d | Adapted from | N/A |
d.
[Maximum mark: 1]
18M.2.hl.TZ1.d
This question is about ethene, C2H4, and ethyne, C2H2.
One possible Lewis structure for benzene is shown.
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]
