Question

Possible isomers for 4-bromo,7-chloro,4-hydroxy, 2,6-dimethyl heptanoic acid

Answer 1

There are possible a lot of structural isomers, only for the molecule without halogens there are more than 8000 of them. But it is possible to count stereoisomers. There are 3 stereocenters in the molecule, which means that there are 23=8 possible stereoisomers. As there is no symmetry in this molecule, there are 8 possible stereoisomers.