9.17Three isomers have unbranched carbon chains:Next consider all the alkynes with a single methyl branch:One isomer has two methyl branches. None is possible with an ethyl branch.9.18(a)(b)(c)(d)(e)(f)(g)9.19(a)(b)(c)(d)(e)(f)4-Ethyl-1-hexyne is CH3CH2CHCH2CCH2CH3CH2,5-Dimethyl-3-hexyne is CH3CHCCH3CCHCH3CH34-Octyne is CH3CH2CH2CCCH2CH2CH33-Octyne is CH3CH2CCCH2CH2CH2CH32-Octyne is CH3CCCH2CH2CH2CH2CH31-Octyne is HCCCH2CH2CH2CH2CH2CH3CH3CCCH3CH3CCCH3 is 2,2,5,5-tetramethyl-3-hexyneCH3CH3324651CH3CH2CH2CH2CHCH2CH2CH2CH2CH3 is 4-butyl-2-nonyneCCCH345 6 7 8 9321(Parent chain must contain the triple bond.)CCH223CH2C113is cyclotridecyneCH
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