30 ALKANES There is one isomer characterized by an ethyl substituent on a five-carbon chain: H3,)3CH 3-Ethylpentane The remaining isomer has three methyl substituents attached to a four-carbon chain. (CH3)3 CCH(CH3)2 2, 2, 3-Trimethylbutane 2.17 In the course of doing this problem, you will write and name the 17 alkanes that, in addition to oc- tane, CH;(CH2)CH3, comprise the 18 constitutional isomers of C&H (a) The easiest way to attack this part of the exercise is to draw a bond-line depiction of heptane and add a methyl branch to the various positions 2-Methy heptane 3-Methy heptane 4-Methylheptane Other structures bearing a continuous chain of seven carbons would be duplicates of the isomers rather than unique isomers. 5-Methy heptane, " for example, is an incorrect name methy heptane, and"6-methy heptane"is an incorrect name for 2-methy heptane (b Six of the isomers named as derivatives of hexane contain two methyl branches on a continu- ous chain of six carbons Dimethy lhexane 2, 3-Dimethy lhexane 2, 4-Dimethy lhexane ,5-Dimethy lhexane 3, 3-Dimethylhexane 3. 4-Dimethylhexane One isomer bears an ethyl substituent (c) Four isomers are trimethyl-substituted derivatives of pentane 义人 .3, 3-Trimethylpentane 2. 2. 4-Trimethylpentane Back Forward Main Menu TOC Study Guide Toc Student OLC MHHE WebsiteThere is one isomer characterized by an ethyl substituent on a five-carbon chain: The remaining isomer has three methyl substituents attached to a four-carbon chain. 2.17 In the course of doing this problem, you will write and name the 17 alkanes that, in addition to oc￾tane, CH3(CH2)6CH3, comprise the 18 constitutional isomers of C8H18. (a) The easiest way to attack this part of the exercise is to draw a bond-line depiction of heptane and add a methyl branch to the various positions. Other structures bearing a continuous chain of seven carbons would be duplicates of these isomers rather than unique isomers. “5-Methylheptane,” for example, is an incorrect name for 3-methylheptane, and “6-methylheptane” is an incorrect name for 2-methylheptane. (b) Six of the isomers named as derivatives of hexane contain two methyl branches on a continu￾ous chain of six carbons. One isomer bears an ethyl substituent: (c) Four isomers are trimethyl-substituted derivatives of pentane: 2,2,3-Trimethylpentane 2,3,3-Trimethylpentane 2,2,4-Trimethylpentane 2,3,4-Trimethylpentane 3-Ethylhexane 2,2-Dimethylhexane 2,3-Dimethylhexane 2,4-Dimethylhexane 2,5-Dimethylhexane 3,3-Dimethylhexane 3,4-Dimethylhexane 2-Methylheptane 3-Methylheptane 4-Methylheptane 2,2,3-Trimethylbutane (CH3)3CCH(CH3)2 3-Ethylpentane (CH3CH2)3CH 30 ALKANES Back Forward Main Menu TOC Study Guide TOC Student OLC MHHE Website