Subject - Chemistry:

Basics

MCQ - 292-2478

Question:

Which reagent could detect the presence of added alcohol in petrol consisting mainly of a mixture of alkenes

Na
Br₂
kMnO₄
Br₂

Correct Answer: A

Explanation:

A small piece of sodium is dropped into some ethanol, it reacts steadily to give off bubbles of hydrogen gas and leaves a colourless solution of sodium ethoxide, CH₃CH₂ONa. Sodium ethoxide is known as an alkoxide.
If the solution is evaporated carefully to dryness, the sodium ethoxide is left as a white solid.

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