DP Chemistry (last assessment 2024)

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Question 20N.2.hl.TZ0.2g(ii)

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.2.hl.TZ0.2g(ii)
Level hl Paper 2 Time zone TZ0
Command term Suggest Question number g(ii) Adapted from N/A
g(ii).
[Maximum mark: 2]
20N.2.hl.TZ0.2g(ii)

Compound A is in equilibrium with compound B.

(g(ii))

Propanone can be synthesized in two steps from propene.

Suggest why propanal is a minor product obtained from the synthetic route in (g)(i).

[2]

Markscheme

primary carbocation «intermediate forms»
OR
minor product «of the water addition would be» propan-1-ol
OR
anti-Markovnikov addition of water ✔

primary alcohol/propan-1-ol oxidizes to an aldehyde/propanal ✔

Examiners report

This question regarding the formation of a minor product was not well answered. Many candidates struggled to explain the formation of propan-1-ol and to then oxidize it to propanal.

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