May/June 2026 Paper 22

2026 · 6 questions · 40 parts · 60 marks

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5(a)Organic Nomenclature FormulaeEasy2 marks

Hexane, CH

_{3}

(CH

_{2}

)

_{4}

_{3}

, reacts with Cl

_{2}

(g) in the presence of ultraviolet light to produce different organic products, including those shown in Table 5.1.

Complete Table 5.1.

structure of product	systematic name of product
CH $_{3}$ (CH $_{2}$ ) $_{5}$ Cl	Table answer r1_systematic name of product
CH $_{3}$ (CH $_{2}$ ) $_{3}$ CHClCH $_{3}$	Table answer r2_systematic name of product
CH $_{3}$ (CH $_{2}$ ) $_{3}$ CHClCH $_{2}$ Cl	1,2-dichlorohexane
CH $_{3}$ (CH $_{2}$ ) $_{10}$ CH $_{3}$	dodecane
CH $_{3}$ (CH $_{2}$ ) $_{3}$ CH(CH $_{3}$ )CH(CH $_{3}$ )(CH $_{2}$ ) $_{3}$ CH $_{3}$	5,6-dimethyldecane

5(b)(i)Organic Reaction Types MechanismsEasy1 mark

The mechanism for the reaction of hexane with Cl

_{2}

(g) involves three stages: stage 1 initiation, stage 2 propagation, stage 3 termination. In stage 1 and 2, free radicals are produced. Describe what is meant by free radical.

Answer

0 words

5(b)(ii)Organic Reaction Types MechanismsEasy1 mark

Name the type of bond breaking that occurs to produce the free radical •C

l

from C

l_{2}

5(b)(iii)AlkanesMedium2 marks

Suggest a reaction sequence of two propagation reactions that result in CH

_{3}

(CH

_{2}

)

_{4}

_{3}

forming CH

_{3}

(CH

_{2}

)

_{3}

CHClCH

_{3}

Propagation reaction 1: CH

_{3}

(CH

_{2}

)

_{4}

_{3}

\to

...

0 words

Propagation reaction 2: ...

\to

_{3}

(CH

_{2}

)

_{3}

CHClCH

_{3}

0 words

5(b)(iv)AlkanesMedium2 marks

Suggest a reaction sequence of one propagation reaction followed by a termination reaction that results in CH

_{3}

(CH

_{2}

)

_{4}

_{3}

forming CH

_{3}

(CH

_{2}

)

_{10}

_{3}

Propagation reaction: CH

_{3}

(CH

_{2}

)

_{4}

_{3}

\to

...

0 words

Termination reaction: ...

\to

_{3}

(CH

_{2}

)

_{10}

_{3}

0 words

5(c)AlkanesEasy1 mark

The proportion of each product varies depending on the type of free radical intermediate that is produced.

Table 5.2

primary free radical	secondary free radical	tertiary free radical
$∙ C (C H_{3}) H_{2}$	$∙ C (C H_{3})_{2} H$	$∙ C (C H_{3})_{3}$

(The table shows increasing stability of the radical from primary, through secondary, to tertiary.) Use Table 5.2 to suggest which factor determines the increased stability of free radicals from primary to secondary to tertiary.