CAIE A-Level Chemistry AS 21.1.2 Devise Multi Step Synthetic Routes Questions

Practise CAIE 9701 multi-step synthesis by working backwards from a target, matching carbon count and selecting valid intermediates, reagents and conditions.

Exam points

work backwards from the target functional group to a plausible immediate precursor
write each intermediate explicitly and specify reagent, solvent, heat, reflux or pressure where required
use routes such as alcohol → halogenoalkane → nitrile only when carbon-count and connectivity match

[Maximum number: 1]

2-bromopropane is converted to 1,2-dibromopropane in a pathway involving two reactions.

\text { 2-bromopropane } \xrightarrow{\text { reaction } 1} \text { compound } X \xrightarrow{\text { reaction } 2} \text { 1,2-dibromopropane }

What are the reagents and conditions for the two reactions?

reaction 1

reaction 2

heat under reflux with aqueous NaOH

$\mathrm{HBr}(\mathrm{g})$ at room temperature

heat under reflux with aqueous NaOH

$\mathrm{Br}_{2}(\mathrm{l})$ at room temperature

heat under reflux with ethanolic NaOH

$\mathrm{HBr}(\mathrm{g})$ at room temperature

heat under reflux with ethanolic NaOH

$\mathrm{Br}_{2}(\mathrm{l})$ at room temperature

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CAIE A-Level Chemistry AS 21.1.2 Devise Multi Step Synthetic Routes Questions question 1