A bottle of iodo-norbornane carboxylic acid contains a mixture of two diastereomers, 
A and 
B. You make the sodium salts of the carboxylic acids and only one of the isomers reacts to form a new compound, 
C. The other isomer does not react and remains the sodium salt. 
a. Draw the structure of compound C. 
b. Is C the product of A or B? 
c. Provide a one to two sentence mechanistic explanation for why one of the carboxylates reacts to form a new compound and the other does not