DP Chemistry (last assessment 2024)
Question 19N.3.sl.TZ0.4a
| Date | November 2019 | Marks available | [Maximum mark: 1] | Reference code | 19N.3.sl.TZ0.4a |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Draw | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
19N.3.sl.TZ0.4a
Polypropene is used to make many objects including carpets, stationery and laboratory equipment.
(a)
Draw a section of an isotactic polypropene polymer chain containing four repeating units.
[1]
Markscheme
NOTE: Continuation bonds must be shown.
Ignore square brackets and “n”.
Do not accept one repeating unit in square brackets with a subscript of 4.
Accept condensed structure provided all C to C bonds are shown and CH3 groups on same side.
Accept
Do not accept syndiotactic (alternating orientation of the CH3 groups).
