Hexane () is a straight-chain alkane. Including both linear and branched frameworks, what is the absolute total number of structural isomers possible for the formula ?

Question

Hexane ($C_6H_{14}$) is a straight-chain alkane. Including both linear and branched frameworks, what is the absolute total number of structural isomers possible for the formula $C_6H_{14}$?

Prashant Kotian · Accepted Answer

Correct answer: C. The molecular formula corresponds to a fully saturated acyclic alkane (). Systematically drawing the possible carbon skeletons yields: n-hexane (straight), 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, and 2,3-dimethylbutane. This rigorously totals exactly 5 structural isomers.

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