DP Chemistry (last assessment 2024)
Question 22M.2.hl.TZ2.d(v)
| Date | May 2022 | Marks available | [Maximum mark: 2] | Reference code | 22M.2.hl.TZ2.d(v) |
| Level | hl | Paper | 2 | Time zone | TZ2 |
| Command term | Justify, Predict | Question number | d(v) | Adapted from | N/A |
d(v).
[Maximum mark: 2]
22M.2.hl.TZ2.d(v)
Carbon forms many compounds.
Predict, giving a reason, the major product of reaction between but-1-ene and steam.
[2]
Markscheme
CH3CH2CH(OH)CH3 ✔
«secondary» carbocation/CH3CH2CH+CH3 more stable ✔
Do not accept “Markovnikov’s rule” without reference to carbocation stability.
Examiners report
Product was correctly predicted by many, but most used Markovnikov's Rule to justify this, failing to mention the stability of the secondary carbocation, i.e., the chemistry behind the rule.
