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In an IUPAC name, which part of the name indicates the number of carbon atoms in the parent chain?
ASecondary suffix
BPrefix
CPrimary suffix
DRoot word
Answer & Solution
Correct answer: D. Root word
1. The prefix shows the substituent or branch present.
2. The primary suffix shows the nature of carbon-carbon bonding (ane/ene/yne).
3. The secondary suffix shows the functional group.
4. The root word describes the carbon skeleton and gives the number of carbon atoms, so the answer is root word.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 11 "Carbon and its Compounds", p.167_
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