Problem 4.26a Draw all possible structure(s) and give the IUPAC
systematic name(s) of an alkane or cycloalkane with the formula
C8H18 that has only primary hydrogen atoms. Select the IUPAC
systematic name(s) (all drawn in previous step):
2,2,3-trimethylpentane octane 2,3-dimethylhexane 2-methylheptane
methylcycloheptane 2,2,3,3-tetramethylbutane
1-methyl-2-ethyl-pentane 2,2-dimethylhexane