9. Draw an acceptable structure for each of the following alkanes. a) ethylhexane b) 4-(dimethylethyl)-3,6-diethyl-5-methyloctane b) a) 10. Draw an acceptable structure for each of the following alkanes. a) propylheptane b) S-butyl-3,7-dimethyl-6-(2-methylpropyl)decane b) 11. Draw the two (2) alkane isomers of the formula C-H1o. 12. Draw the five (5) alkane isomers of the formula C-H16 that have five (5) carbons in their longest chain