DP Chemistry (last assessment 2024)

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

Date	November 2020	Marks available	[Maximum mark: 3]	Reference code	20N.2.hl.TZ0.2g(i)
Level	hl	Paper	2	Time zone	TZ0
Command term	Suggest	Question number	g(i)	Adapted from	N/A

g(i).

[Maximum mark: 3]

20N.2.hl.TZ0.2g(i)

Compound A is in equilibrium with compound B.

(g(i))

Propanone can be synthesized in two steps from propene. Suggest the synthetic route including all the necessary reactants and steps.

[3]

Markscheme

$H_{2} O$ /water «and $H^{+}$ » ✔

${CH}_{3} CH (OH) {CH}_{3}$ /propan-2-ol ✔

$K_{2} {Cr}_{2} O_{7}$ /«potassium» dichromate(VI) AND $H^{+}$
OR
${KMnO}_{4}$ /«acidified potassium» manganate(VII) ✔

Accept $H_{3} O^{+}$ .

Examiners report

The mean mark was ⅔ for the required synthetic route. Some candidates failed to identify water as a reagent in the hydration reaction, or note that dichromate ion oxidation requires acidic conditions. This was also the question with most No Response.

Syllabus sections

Additional higher level (AHL)

Additional higher level (AHL) » Topic 20: Organic chemistry » 20.2 Synthetic routes

Additional higher level (AHL) » Topic 20: Organic chemistry

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

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