JAMB Chemistry 2012 Objective — Question 41

Question 41 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2012 Objective paper, with the correct answer and a full explanation.

Alkanals can be distinguished from alkanones by the reaction with

A. sudan III stain
B. starch iodide paper
C. lithium tetrahydrido aluminate(III)
D. Fehling's solutionCorrect

Explanation

Alkanals (aldehydes) give a positive test with Fehling's solution (forming a brick-red precipitate), while alkanones (ketones) do not.

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