Question

Find stereoisomers possible for CH3-CH(OH)-CH3

Answer 1

As others have said, there are two (different) chiral centres so there are a total of 2^n (ie 4) stereoisomers arranged as two pairs of enantiomers (stereoisomers related as object and mirror image). The isomers not related in this way are diastereomers. The diagram below shows a similar compound.