(f)Recall that an alkyl group is numbered from the point of attachment. The structure of(2,2-dimethylpropyl)cyclohexane is(g)The name “pentacosane”contains no numerical locants or suffxes indicating the presence ofalkyl groups. It must therefore be an unbranched alkane. Table 2.4 in the text indicates that thesuffx -cosane refers to alkanes with 20–29 carbons. The prefx penta- stands for “fve,”and sopentacosane must be the unbranched alkane with 25 carbons. Its condensed structural formulais CH3(CH2)23CH3.(h)We need to add a 1-methylpentyl group to C-10 of pentacosane. A 1-methylpentyl group is:It has fve carbons in the longest continuous chain counting from the point of attachment andbears a methyl group at C-1. 10-(1-Methylpentyl)pentacosane is therefore:2.19(a)This compound is an unbranched alkane with 27 carbons. As noted in part (g) of the preced-ing problem, alkanes with 20–29 carbons have names ending in -cosane. Thus, we add theprefx hepta- (“seven”) to -cosane to name the alkane CH
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