CAIE A-Level Chemistry AS 16.1.3 Classify Alcohols As Primary Secondary Questions

Practise classifying alcohols by the carbon bonded to OH and distinguishing primary, secondary and tertiary classes using oxidation and iodoform evidence.

Exam points

count carbon groups attached to the C–OH carbon to classify primary, secondary or tertiary alcohols
use acidified dichromate orange-to-green oxidation for primary and secondary but not tertiary alcohols
use alkaline iodine selectively for alcohols containing CH3CH(OH)– and interpret the observation

[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

Reaction 3 takes place when $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}$ is heated under reflux with acidified potassium dichromate(VI) solution.

State the colour change that takes place in the reaction mixture.

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CAIE A-Level Chemistry AS 16.1.3 Classify Alcohols As Primary Secondary Questions question 1