alleryA straight five-carbon chain carries a methyl group on the second carbon counted from the nearer end. What is its IUPAC name?
A2-Methylbutane
B3-Methylpentane
C2-Methylpentane
D2-Methylhexane
Answer & Solution
Correct answer: C. 2-Methylpentane
1. The longest chain has five carbons, so the root word is Pent and the name ends in -ane (all single bonds). This rules out the butane and hexane options.
2. Numbering starts from the end nearer the branch, placing the methyl group on carbon 2, not carbon 3, so 3-methylpentane is wrong.
3. The substituent is a methyl group at locant 2, giving the prefix 2-Methyl.
4. Combining: 2-Methyl + pent + ane = 2-Methylpentane.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 11 "Carbon and its Compounds", p.168_
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