What are N and M ?

Step-by-step solution

In these, (iii) and (iv) are enantiomers and (v) and (vi) are also enantiomers to each other. Thus total six isomers will be possible for N . In these only four isomers will be obtained on fractional distillation without resolution because d and l isomers (i.e., (iii) & (iv) and (v) & (vi)) cannot be separated by fractional distillation. Hence N=6 and M=4 .