Question detail
What is the functional group present in carboxylic acids?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reactions of alkenes and alcohols (chemistry only)
Question
- A. -OH
- B. -COOH
- C. -CHO
- D. -NH2
Answer
The correct option is -COOH.
Explanation
The correct option is -COOH. -COOH is correct because it directly supports the approved learning objective to describe what happens when any of the first four carboxylic acids dissolve in water. This belongs to Carboxylic acids within Reactions of alkenes and alcohols (chemistry only), so the answer must use the correct organic chemistry context. The other options are incorrect when they confuse the organic family, formula type, reaction condition, product, or property being tested. Keep molecular formula, structural formula, displayed formula, and general formula distinct. Do not confuse alkanes with alkenes, saturated with unsaturated, cracking with combustion, polymers with monomers, or hydrocarbons with oxygen-containing alcohols and carboxylic acids. When formulae are used, preserve the stored notation exactly and explain the GCSE chemistry idea in words rather than using unsupported displayed-formula diagrams.
Common mistake
Partial Ionisation of Carboxylic Acids
Students often assume that carboxylic acids completely dissociate into ions when they dissolve in water, just like strong acids.
In reality, carboxylic acids are weak acids; when dissolved they only partially ionise, establishing an equilibrium between the undissociated acid (RCOOH) and its ions (RCOO⁻ and H⁺).
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