Question detail
Which functional group is identified by the reaction of a carboxylic acid with sodium bicarbonate?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Organic analysis
Question
- A. Alcohol
- B. Aldehyde
- C. Alkene
- D. Carboxylic acid
Answer
Carboxylic acid
Explanation
The reaction of a carboxylic acid with sodium bicarbonate produces carbon dioxide gas, which can be observed as effervescence, confirming the presence of the carboxylic acid functional group.
Common mistake
Identifying Functional Groups
Students often confuse the test-tube reactions for alcohols and aldehydes, leading to incorrect identification.
To correctly identify functional groups, remember that alcohols react with acidified potassium dichromate to produce a color change from orange to green, while aldehydes also react but may produce a different observable change when tested with Tollens' reagent, forming a silver mirror.
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