Which reagent detects the presence of added alcohol in petrol consisting of a mixture of alkanes and alkenes?

ANa.

Br_2

(in

CCl_4

KMnO_{4(aq)}

NaOH_{(aq)}

Explanation: The marking scheme gives answer A. Sodium reacts with the -OH group of alcohols to give hydrogen gas. Alkanes do not react with sodium. Alkenes react with

Br_2

and

KMnO_4

, so those reagents cannot distinguish alcohol from alkene.

ZIMSEC Chemistry Paper 3, June 2009, Q16

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Which reagent detects the presence of added alcohol in petrol consisting of a mixture of alkanes and alkenes?

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