Which of the following is NOT a branched alkane?
N-pentane
A branched alkane has at least one carbon attached to three or four other carbons, so the chain has side branches.
n-Pentane (normal pentane), CH₃–CH₂–CH₂–CH₂–CH₃, has all five carbons in one continuous straight chain — it has no branch.
Isopentane (2-methylbutane), neopentane (2,2-dimethylpropane) and isobutane (2-methylpropane) all carry methyl branches on the main chain, so they are branched alkanes.
Hence, the answer is N-pentane.
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