CAIE A-Level Chemistry AS 16.1.4 Ch3ch Oh Alcohol Identification Questions

Practise the alkaline iodine test for alcohols: predict yellow triiodomethane, identify qualifying structures and distinguish isomers.

Exam points

identify a CH3CH(OH)– group before predicting a positive alkaline iodine test
state formation of pale-yellow triiodomethane (CHI3) and the carboxylate ion
count qualifying alcohol isomers and recognise methyl ketones can also give the iodoform reaction

[Maximum number: 1]

Four different alcohols are treated with alkaline $\mathrm{I}_{2}(\mathrm{aq})$ .
Which row is correct?

name of alcohol

formulae of products

butan-2-ol

$\mathrm{CH}_{3} \mathrm{COO}^{-}$ and $\mathrm{CH}_{3} \mathrm{CI}_{3}$

propan-1-ol

$\mathrm{CH}_{3} \mathrm{COO}^{-}$ and $\mathrm{CHI}_{3}$

propan-2-ol

$\mathrm{CH}_{3} \mathrm{COO}^{-}$ and $\mathrm{CHI}_{3}$

butan-2-ol

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COO}^{-}$ and $\mathrm{CH}_{3} \mathrm{I}$

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