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CAIE A-Level Chemistry AS 21 Organic Synthesis Questions

Practise functional-group analysis, multi-step route design and identification of reagents, conditions and by-products, checking each transformation against the target structure.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Covered syllabus points

21.1 Organic synthesis

Question 1

[Maximum number: 1]

Compound X is treated with two reagents successively, forming compound Z.

X
Figure for Question 1 — CAIE A-Level Chemistry AS

What could be Z ?

A
Figure for Question 1 — CAIE A-Level Chemistry AS — Option A
B
Figure for Question 1 — CAIE A-Level Chemistry AS — Option B
C
Figure for Question 1 — CAIE A-Level Chemistry AS — Option C
D
Figure for Question 1 — CAIE A-Level Chemistry AS — Option D

Question 2

[Maximum number: 3]

Organic compounds can be distinguished using chemical tests and analytical techniques.

C2 can be synthesised using A1 as a single organic reactant.

A1

A1

C2

C2

Devise a multi-step synthetic route to form C2 from A1. Identify relevant reagents and conditions, and state the organic products of each step.

Question 3

[Maximum number: 1]

Fig. 4.1 shows a possible synthesis of propene, C3H6\mathrm{C}_{3} \mathrm{H}_{6}.

Fig. 4.1

Fig. 4.1

Suggest a suitable reagent for reaction 2 .

Question 4

[Maximum number: 1]

Citral is found in lemongrass oil. It can react to give compound W.

Figure for Question 4 — CAIE A-Level Chemistry AS

What could compound W be?

A
Figure for Question 4 — CAIE A-Level Chemistry AS — Option A
B
Figure for Question 4 — CAIE A-Level Chemistry AS — Option B
C
Figure for Question 4 — CAIE A-Level Chemistry AS — Option C
D
Figure for Question 4 — CAIE A-Level Chemistry AS — Option D
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