CAIE AS Chemistry 13.1.3 Functional Groups & Properties

Practise linking an organic compound’s functional group to its characteristic physical properties and reactions, using diagnostic tests and structural evidence to identify…

Exam points

locate the functional group before predicting a compound’s characteristic reaction or chemical test
use bromine water for C=C and Tollens’ reagent for an aldehyde only when the structure supports the test
explain why compounds with the same carbon skeleton can behave differently when their functional groups differ

[Maximum number: 1]

The formulae of three compounds are shown.

\mathrm{C}_{3} \mathrm{H}_{7} \mathrm{CHO} \quad \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{COCH}_{3} \quad \mathrm{CH}_{2} \mathrm{CHCH}_{2} \mathrm{CH}_{2} \mathrm{OH}

Only one of these compounds will decolourise bromine water. Only one of these compounds will produce a silver mirror with Tollens' reagent.

Which row shows the correct results?

decolourises bromine water

forms a silver mirror with Tollens' reagent

$\mathrm{C}_{3} \mathrm{H}_{7} \mathrm{CHO}$

$\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{COCH}_{3}$

$\mathrm{C}_{3} \mathrm{H}_{7} \mathrm{CHO}$

$\mathrm{CH}_{2} \mathrm{CHCH}_{2} \mathrm{CH}_{2} \mathrm{OH}$

$\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{COCH}_{3}$

$\mathrm{CH}_{2} \mathrm{CHCH}_{2} \mathrm{CH}_{2} \mathrm{OH}$

$\mathrm{C}_{3} \mathrm{H}_{7} \mathrm{CHO}$

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13.1.3—Compounds in the table on pages 29 and 30 question 1