May/June 2026 Paper 43

2026 · 9 questions · 63 parts · 100 marks

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1(a)1(b)1(c)1(d)(i)1(d)(ii)1(e)1(f)

–/14 mks

2(a)(i)2(a)(ii)2(b)(i)2(b)(ii)2(c)(i)2(c)(ii)2(c)(iii)2(d)

–/11 mks

3(a)3(b)3(c)(i)3(c)(ii)3(d)(i)3(d)(ii)

–/9 mks

4(a)4(b)4(c)4(d)4(e)

–/10 mks

5(a)5(b)5(c)5(d)5(e)(i)5(e)(ii)5(e)(iii)5(e)(iv)

–/13 mks

6(a)6(b)(i)6(b)(ii)6(b)(iii)6(c)

–/8 mks

7(a)(i)7(a)(ii)7(a)(iii)7(b)(i)7(b)(ii)7(b)(iii)7(b)(iv)7(b)(v)7(c)(i)7(c)(ii)

–/14 mks

8(a)(i)8(a)(ii)8(a)(iii)8(a)(iv)8(a)(v)8(a)(vi)8(b)(i)8(b)(ii)

–/10 mks

9(a)9(b)(i)9(b)(ii)9(c)(i)9(c)(ii)9(c)(iii)

–/11 mks

8(a)(i)Acyl Chlorides AmidesMedium1 mark

Secondary amine M can be made by the three-step synthesis shown in Figure 8.1.

Figure 8.1, a three-step synthesis: CH3COOH reacts in step 1 to give CH3COCl, which reacts in step 2 to give amide L (shown as a blank box), which reacts in step 3 to give secondary amine M, drawn as CH3CH2-NH-CH(CH3)2

Write an equation for the reaction of CH

_{3}

COOH with SOCl

_{2}

in step 1.

Answer

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8(a)(ii)Acyl Chlorides AmidesEasy1 mark

State an alternative reagent that reacts with CH

_{3}

COOH to produce CH

_{3}

COCl in step 1.

Answer

8(a)(iii)Acyl Chlorides AmidesMedium1 mark

Compound L is an amide. Draw the structure of L in Figure 8.1.

Draw with the mouse or a finger.

8(a)(iv)Acyl Chlorides AmidesMedium1 mark

Draw the structure of the reagent added to CH

_{3}

COCl in step 2.

Draw with the mouse or a finger.

8(a)(v)Acyl Chlorides AmidesMedium1 mark

Name the mechanism of the reaction forming L in step 2.

8(a)(vi)Acyl Chlorides AmidesMedium1 mark

Suggest a reagent for step 3.

8(b)(i)Nmr Spectroscopy Structure ElucidationMedium2 marks

The proton (

^{1}

H) NMR spectrum of M dissolved in D

_{2}

O is obtained. Four of the proton environments, r, s, t and u, are labelled on the structure of M in Figure 8.2.

Figure 8.2, the structure CH3CH2-NH-CH(CH3)2 with proton environments labelled: r on the CH3 of the ethyl group, s on the CH2 of the ethyl group, t on the two equivalent CH3 groups of the isopropyl group, and u on the CH of the isopropyl group

Identify the splitting pattern for each of the proton environments r, s, t and u.

Proton environment r

Proton environment s

Proton environment t

Proton environment u

8(b)(ii)Nmr Spectroscopy Structure ElucidationMedium2 marks

The proton (

^{1}

H) NMR spectrum of M dissolved in CDCl

_{3}

is obtained. State and explain how this spectrum differs from the proton (

^{1}

H) NMR spectrum of M dissolved in D

_{2}

Answer

0 words