JAMB Chemistry 2019 Objective — Question 33

Question 33 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2019 Objective paper, with the correct answer and a full explanation.

Which of the following reagents can be used to differentiate alkanals from alkanones?

A. Hydrogen cyanide
B. Sodium hydrogen trioxocarbonate (IV)
C. Fehling's reagentCorrect
D. 2,4-dinitrophenylhydrazine

Explanation

Fehling's reagent is used to differentiate alkanals from alkanones. Alkanals (aldehydes) have an oxidizable hydrogen atom and are oxidized by Fehling's reagent (giving a positive test), while alkanones (ketones) are not affected, as they lack this oxidizable hydrogen.

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