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JAMB Chemistry 2016 Paper

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Question : 22

Total: 50

The products formed when primary Alkanols are oxidized using acidified potassium tetraoxomanganate (VII) are what?

CH₃CH₂CHO and H₂O
CH₃CHO and CO₂
CH₃CH₂COOH and H₂
CH₃COOH and CO₂

Solution:

Concept:

Acidified

\mathrm{KMnO_4}

oxidises primary alkanols to alkanoic acids.

Explanation:

For a primary alkanol, the oxidation is:

\mathrm{RCH_2OH + 2[O] \rightarrow RCOOH + H_2O}

So the expected products are an alkanoic acid and water.

Option C is the intended choice, though the by-product should be

\mathrm{H_2O}

, not

\mathrm{H_2}

.

Answer:

$$

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