1,1-Disubstituted: Both conformations are achiral, which is more stable (ie. the minimum energy conformation) depends upon the relative sizes of R and R'.
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1,2-Cis-disubstituted: Both conformations are chiral, which is more stable (ie. the minimum energy conformation) depends upon the relative sizes of R and R'.
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1,2-Trans-disubstituted: Both conformations are chiral, the conformation with both substituents in equatorial positions will be the minimum energy conformation.
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1,3-Cis-disubstituted: Both conformations are chiral, the conformation with both substituents in equatorial positions will be the minimum energy conformation.
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1,3-Trans-disubstituted: Both conformations are chiral, which is more stable (ie. the minimum energy conformation) depends upon the relative sizes of R and R'.
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1,4-Cis-disubstituted: Both conformations are achiral, which is more stable (ie. the minimum energy conformation) depends upon the relative sizes of R and R'.
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1,4-Trans-disubstituted: Both conformations are achiral, the conformation with both substituents in equatorial positions will be the minimum energy conformation.
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b) The structures of the minimum energy conformation of the 12 possible
isomers are shown below.
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