Stereochemistry and aromaticity UE Past Papers Questions.

Calculate the relative proportions of (+)-2-butanol and (-)-2-butanol required to give a specific rotation of 0.54° given that the specific rotation of pure (+)-2-butanol is 13.5°.

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With examples outline the Fisher projection of conformers.

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Draw Newman projection for most stable conformer of each of molecule;

1. Butane
2. Methylcyclobutane
3. Chlorocyclopentane
4. Pentane

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Distinguish between configuration isomer and conformational isomer.

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Define the following terms

1. Optical isomers
2. Diastereomers
3. Optical activity
4. Steric strain

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