need help with 11 and 13 the two w star next to them!

PROBLEM 11 USETHE STRATEGY Draw the structure for each of the following: (1) Draw the structure b. 2,3-dimethylhexane d. 2,4,5-trimethyl-4-(1-methylethyl)heptane e. 2,5-dimethyl-4-(2-methylpropyl)octane of EaCh: line angle 3 f. 4-(1.1-dimethylethyl)octane c. 4,4-diethyldecane expanded lewis. PROBDE 12 SOLVED d. Which isomers contain an isopgoget prow? a. Draw the 18 isomedic octanes. e. Which isomers contain antobatyl group? b. Give each isomer its systemantic name. f. Which isgmesectitain a tenthatyl group? (2) Write the molecular SOLUTION TO 12 a. Start with the isomer with formula of each a seven-carbon contunuous chain pius gpednethy group. Fhith. drav isomers wils a six-carbon coobicuous chain plus two methyl groums ofone cthyl group. Then draw isociscimith a five-carbot coakinuous chain. K PROBLEM 13 Give each sabstituent on the nine-carbon chain a common name and a parenthecical name.32 2) Wrile trie molecular folmulo a. b. c