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CAIE AS Chemistry 18 Carboxylic Acids & Derivatives

Practise preparing and reacting carboxylic acids and converting among acids, esters and related derivatives, writing equations with appropriate reagents, conditions and products.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

18. Carboxylic acids and derivatives question 1

[Maximum number: 1]

Y is made from Q in a three-step reaction.

Fig. 5.4

Fig. 5.4

In step 2, W is heated with HCl(aq) to produce X and an inorganic product.

Identify the formula of the inorganic product.

18. Carboxylic acids and derivatives question 2

[Maximum number: 2]

4(CH3)3CCHO4\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCHO} is used in the synthesis of some antibiotics.

Two reaction sequences are shown.

Figure for Question 18. Carboxylic acids and derivatives question 2 — CAIE A-Level Chemistry AS
Figure for Question 18. Carboxylic acids and derivatives question 2 — CAIE A-Level Chemistry AS

Draw the structure of the organic molecule T that reacts with A,(CH3)3CCO2H\mathbf{A},\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCO}_{2} \mathrm{H}, in reaction 2, to form U.

Suggest a catalyst for reaction 2.
T
catalyst

18. Carboxylic acids and derivatives question 3

[Maximum number: 4]

Allyl chloride is an important chemical used in the manufacture of plastics, pharmaceuticals and pesticides.

allyl chloride

allyl chloride

Question (a)

(a)

A series of reactions starting from allyl chloride is shown.

Figure for Question (a) — CAIE A-Level Chemistry AS
[ 4 ]

Question (i)

(i)

In reaction 2, the organic product of reaction 1 is mixed with concentrated H2SO4\mathrm{H}_{2} \mathrm{SO}_{4} and an organic acid, and then heated under reflux.

State the role of the concentrated H2SO4\mathrm{H}_{2} \mathrm{SO}_{4}. Identify the organic acid used.
role of the concentrated H2SO4\mathrm{H}_{2} \mathrm{SO}_{4}
identity of the organic acid

[ 2 ]

Question (ii)

(ii)

The organic product of reaction 3 is Y.
Y can be hydrolysed using excess aqueous H2SO4\mathrm{H}_{2} \mathrm{SO}_{4} to form Z.
The molecular formula of Z is C4H8O4\mathrm{C}_{4} \mathrm{H}_{8} \mathrm{O}_{4}.
Draw the structure of Z.

[ 2 ]
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