(b)Both models represent alkanes of molecular formula C6H14. In each one the carbon chain isunbranched. The two models are different conformations of the same compound,CH3CH2CH2CH2CH2CH3(hexane).(c)The two compounds have the same constitution; both are (CH3)2CHCH(CH3)2. The Newmanprojections represent different staggered conformations of the same molecule: in one thehydrogens are anti to each other, whereas in the other they are gauche.(d)The compounds differ in the orderin which the atoms are connected. They are constitutionalisomers. Although the compounds have different stereochemistry (one is cis, the other trans),they are not stereoisomers. Stereoisomers must have the same constitution.(e)Both structures are cis-1-ethyl-4-methylcyclohexane (the methyl and ethyl groups are both“up”). In the structure on the left, the methyl is axial and the ethyl equatorial. The orientationsare opposite to these in the structure on the right. The two structures are ring-flipped forms of
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