DP Chemistry (last assessment 2024)
Question 18M.2.hl.TZ2.b.iv
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.2.hl.TZ2.b.iv |
| Level | hl | Paper | 2 | Time zone | TZ2 |
| Command term | Justify, Suggest | Question number | b.iv | Adapted from | N/A |
b.iv.
[Maximum mark: 2]
18M.2.hl.TZ2.b.iv
A tertiary halogenoalkane with three different alkyl groups, (R1R2R3)C−X, undergoes a SN1 reaction and forms two isomers.
Suggest, giving a reason, the percentage of each isomer from the SN1 reaction.
[2]
Markscheme
«around» 50% «each»
OR
similar/equal percentages
nucleophile can attack from either side «of the planar carbocation»
Accept “racemic mixture/racemate” for M1.
[2 marks]
