Chemistry Questions and Answers – Uses of Aldehydes and Ketones

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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?
a) Methanal
b) Ethanal
c) Acetone
d) Benzaldehyde
View Answer

Answer: a
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.
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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.
View Answer

Answer: d
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?
a) Vanillin
b) Acetophenone
c) Acetone
d) Camphor
View Answer

Answer: c
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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