Answer:
Option A,B,C
Explanation:
Converting all of them into Fischer projection
Since 'M' and 'N' have --OH on the same side and opposite side respectively, they cannot be a mirror image, they are diastereomers.
'M and 'O'are identical
Note Fischer projection represents eclipse form of sawhorse projection'
For comparison purposes, similar types of eclipse conformers must be drawn i'e', both vertically up or both vertically down
'M' aod 'P' are non-superimposable mirror images, hence, enantiomers
'M' and Q' are non-identical they are distereomers.
