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A:
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How many isomeric dimethylcyclobutanes are there
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- Draw six isomeric cyclopentanes of molecular formula C7H14. These will include four constitutional isomers, of which two show geometric (cis-trans) stereoisomerism.When cyclohexane is substituted by an ethynyl group, -C=CH, the energy difference between axial and equatorial conformations is only 1.7 kJ (0.41 kcal)/mol. Compare the conformational equilibrium for methylcyclohexane with that for ethynylcyclohexane and account for the difference between the two.Explain Conformations of Acyclic Alkanes—Ethane ?
- Draw and name all possible isomers of trimethylcyclopropane. Which of these isomers are chiral?Only three stereoisomers are possible for 2,3-dibromo-2, 3-dichlorobutane. Draw them, indicating which pair are enantiomers (optical isomers). Why does the other isomer not have an enantiomer?How many degrees of unsaturation does C8H10 have?
- What is the relationship between the following pairs of compounds; Are the constitutional isomers, conformational isomers, enantiomers, diastereomers?how to calculate the percentage of axial and exuatorial in conformation in organic chemistryConstruct the chair structures with the molecular models for trans-1-ethyl-3-methylcyclohexane. Find the energy of each conformer, the equilibrium constant Keq, and the percentage of each conformer at 25oC. Indicate which conformer is more stable.