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CAIE A-Level Chemistry 13.2 Characteristic Organic Reactions Question Bank

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

Exam points

name a reaction type by comparing functional groups in reactant and product structures
distinguish nucleophilic, electrophilic and radical mechanisms from the attacking species
follow a multi-step scheme to predict the major product and classify each conversion

Covered syllabus points

13.2.1—Organic reaction terminology 13.2.2—Terminology associated with types

[Maximum number: 1]

Fig. 4.1 shows how propane, $\mathrm{C}_{3} \mathrm{H}_{8}$ , can be converted to propanoic acid, $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOH}$ .

Fig. 4.1

Fig. 4.1

Reaction 1 in Fig. 4.1 takes place in the presence of sunlight.

\mathrm{C}_{3} \mathrm{H}_{8}+\mathrm{Cl}_{2} \rightarrow \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Cl}+\mathrm{HCl}

The reaction takes place via initiation, propagation and termination steps.

Reaction 1 is initiated by the bond fission of $\mathrm{Cl}_{2}$ .

State the type of bond fission shown in the initiation step.

[Maximum number: 1]

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

allyl chloride

allyl chloride

A series of reactions starting from allyl chloride is shown.

Figure for Question 13.2 Characteristic organic reactions question 2 — CAIE A-Level Chemistry AS

State the name of the mechanism that occurs in reaction 3 .

nucleophilic substitution / $\mathrm{S}_{\mathrm{N}} 2$

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