This set of Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Uses of Aldehydes and Ketones”.
1. Which of the following is used in the preservation of biological specimens?
Explanation: Methanal is easily soluble in water and is commercially sold as formalin (40% methanal, 8% methanol, 52% water) and is used for preserving biological specimens.
2. Which of the following is not a use of formaldehyde?
a) Preservation of biological specimens
b) Manufacturing of bakelite
c) Silvering of mirrors
d) Preparation of acetic acid.
Explanation: Formaldehyde consists of only a single carbon atom and cannot be used as a starting compound for the preparation of acetic acid. However, it is used in the manufacture of bakelite, glues and polymeric products. It also acts as a reducing agent in the silvering of mirrors.
3. Which of the following carbonyl compounds are known for their pleasant odour?
Explanation: Acetone belongs to the lower sizes of ketones and is less fragrant than the higher compounds like acetophenone, camphor and vanillin which are used as flavouring agents in different industries.
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