Given the structures of tartaric acid(s), as shown in Fischer Projection: (Note:

Question

Given the structures of tartaric acid(s), as shown in Fischer Projection: (Note: It was in the study of tartaric acid that L. Pasteur stumbled into the new field of stereochemistry, and he was "not a good chemistry student" ) Relating to the above, using strictures I & II & III & IV in your answers, show the relationship and very briefly explain each of your answers from a to f. Give an example of Racemic mixture or modification using structures of I, II, III & IV. Would a 50-50 mixture of "II" and "III" show optical activity ? Why or why not ? Give the R or S configuration of the #2 and #3 carbon atom of the "II & III" structures. What is the relationship between the specific rotation of "I" and "II", if any ?

Explanation / Answer

specific rotation of 2 = - specific rotation of 1 as both are mirror images

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