Test Index

JAMB Chemistry 2011 Paper

Question : 42

Total: 47

Solution:

Concept:

Fehling’s solution is used to distinguish aldehydes from ketones; aldehydes give a brick-red precipitate.

Explanation:

K reduces Fehling’s solution, forming a brick-red precipitate of

\mathrm{Cu_2O}

This reduction is characteristic of alkanals (aldehydes).

L remains unaffected, so it is not an alkanal.

Answer:

C. alkanal

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