Which of the following reaction of carbonyl system is used to distinguish between carbonyl system from alcohols?
Correct answer: B. Bisulfite adduct formation
- A. Cyanohydrin formation
- B. Bisulfite adduct formation
- C. Haloform formation
- D. None of these
Explanation
Sodium bisulfite is used to form adducts with aldehyde and with certain cyclic ketones. These adducts are α-hydroxysulfonic acids. This reaction is useful for the separation and purification of aldehydes. The bisulfite adducts are charged and so are more soluble in polar solvents. This distinguishes carbonyl system from alcohol.
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About Aldehydes and Ketones
Aldehydes and ketones contain the polar carbonyl group, but aldehydes are generally more readily oxidised and more reactive than ketones. Coverage includes preparation by oxidation or reduction routes, nucleophilic addition of reagents such as hydrogen cyanide and bisulfite, and tests that distinguish aldehydes from ketones.
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