A\' (y and g interchanged) lo and a interchanged) 1. Is A \' identical to or the

Question

A' (y and g interchanged) lo and a interchanged) 1. Is A ' identical to or the enantiomer of A? Now construct a model that corresponds to A". 2. Is Aidentical to or the enantiomer of A? 3. What generalization can you make about interchanging any two groups in a Fisher projection? 4. If you were to interchange b and r in formula A', would the resulting molecule correspond to A or its enantiomer? Construct a model to verify your prediction. . If you make an odd number of group interchanges in a Fisher projection formula, is the result the original molecule or its enantiomer? 6. If you make an number of group interchanges in a Fisher projection formula, is the even result the original molecule or its enantiomer? The rotation of a Fisher projection in the plane of the paper also affects the structure it represents. Construct a model that corresponds to A rotated 90° clockwise. + + + + A rotated 90 clockwise A rotated 90 counteredockwise A rotated 180 7. Is the model identical to or the enantiomer of A? Repeat for A rotated counterclockwise. 8. Is the model identical to or the enantiomer of A? Repeat for A rotated 180°. 9. Is the model identical to or the enantiomer of A? 10. What generalization can you make about the rotation of a Fisher projection in the plane of the paper?

Explanation / Answer

1. A and A' represents a pair of enantiomers.

b and r have same place whereas g and y have interchanged their place. When two groups interchange their place, an enantiomer is obtained.

2. A and A" represents a pair of enantiomers.

b and y have same place whereas g and r have interchanged their place. When two groups interchange their place, an enantiomer is obtained.

3. When in a Fischer projection formula, two groups are interchanged, an enantiomer is obtained.

4. If you were to interchange b and r in formula A', the resulting molecule corresponds to enantiomer of A.

On interchange the positions of b and r will be same as in A but the positions of y and g are opposite to that in A. This suggests enantiomer of A.

5. If you make an odd number of group interchanges in a Fisher projection formula, the result is the enantiomer.

6. If you make an even number of group interchanges in a Fisher projection formula, the result is the original molecule.

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