CourseCourseConceptConceptDocumentDocument

CAIE A-Level Chemistry AS 13.2 Characteristic Organic Reactions Questions

Practise classifying organic reactions and mechanisms from definitions, reagents, structures, products and electron-pair movement.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Recognise homologous-series, saturated/unsaturated and addition, substitution, elimination, hydrolysis or condensation terminology from an organic conversion.
  • Distinguish homolytic from heterolytic fission and identify free radicals, initiation, propagation and termination in mechanisms.
  • Identify nucleophiles and electrophiles from lone-pair or electron-pair donation/acceptance and classify the associated organic reaction.
  • Use oxidation and reduction terminology in organic equations, including [O] and [H] notation from oxidising or reducing agents.

Covered syllabus points

13.2.1—Organic reaction terminology13.2.2—Terminology associated with types

Question 1

[Maximum number: 1]

Which pair of reagents react together in a redox reaction?

A

CH3CHCH2+Br2\mathrm{CH}_{3} \mathrm{CHCH}_{2}+\mathrm{Br}_{2}

B

CH3CH2CH2OH+\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}+ concentrated H3PO4\mathrm{H}_{3} \mathrm{PO}_{4}

C

CH3COCH3+HCN\mathrm{CH}_{3} \mathrm{COCH}_{3}+\mathrm{HCN}

D

HCO2C2H5+\mathrm{HCO}_{2} \mathrm{C}_{2} \mathrm{H}_{5}+ dilute H2SO4\mathrm{H}_{2} \mathrm{SO}_{4}

Question 2

[Maximum number: 1]

Which reaction takes place by a nucleophilic addition mechanism?

A

propene reacting with hydrogen bromide

B

2-bromopropane reacting with sodium hydroxide in ethanol

C

propanone reacting with hydrogen cyanide

D

methane reacting with chlorine

Question 3

[Maximum number: 1]

The molecular formula CH3\mathrm{CH}_{3} can represent an anion, a cation or a free radical. Species with the molecular formula CH3\mathrm{CH}_{3} can act as an electrophile, a free radical or a nucleophile depending on the number of outer shell electrons on the central carbon atom.

How many outer shell electrons on the central carbon atom must be present for CH3\mathrm{CH}_{3} to act in these different ways?

CH3\mathrm{CH}_{3} as an

electrophile

CH3\mathrm{CH}_{3} as a

free radical

CH3\mathrm{CH}_{3} as a

nucleophile

6

7

8

6

8

7

7

6

8

8

7

6

All question bank results loaded