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Which two kinds of compound react together to make an ester?
AAn aldehyde and an alcohol
BAn alkane and a carboxylic acid
CAn alcohol and a carboxylic acid
DA ketone and an alkene
Answer & Solution
Correct answer: C. An alcohol and a carboxylic acid
1. An ester is made by joining two molecules and removing a molecule of water between them.
2. One of those molecules must supply a hydroxyl group, which is what an alcohol does.
3. The other must supply a carboxyl group, which is what a carboxylic acid does.
4. An inorganic acid is needed as the catalyst for the reaction.
5. Alkanes have no reactive group to offer here, so they cannot take part.
_Source: Siyavula Physical Sciences Grade 12 (Everything Science, CC BY 4.0), Chapter 4: Organic molecules_
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