Which of the following is not a use of acetaldehyde ?
Correct answer: D. formation of throat lozenges
- A. formation of phenolic resins
- B. formation of mirror
- C. antiseptic inhalant
- D. formation of throat lozenges
Explanation
Acetaldehyde is used for silvering mirrors because it reduces silver ions to metallic silver, and it is also associated with phenolic-resin manufacture and antiseptic inhalants. Throat lozenges are generally listed as a use of formaldehyde rather than acetaldehyde. Students may choose phenolic resins because formaldehyde is the more familiar aldehyde used in phenol-formaldehyde resin, although acetaldehyde can also participate in resin formation.
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About Reactivity of Aldehydes and Ketones
The polar carbonyl group makes aldehydes and ketones undergo nucleophilic addition, reduction and condensation reactions. Aldehydes are generally more reactive and oxidise readily to carboxylic acids, whereas ketones resist mild oxidation; reactions with hydrogen cyanide, sodium bisulfite and 2,4-DNP help identify their behaviour.
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