# Which of the following are diastereomers ?

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Which of the following are diastereomers ?

A. (I) and (III)
B. (II) and (IV)
C. (I) and (II)
D. None

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The Fischer projection of (I) and (II) is wrong because the functional group is not at the top. On rotating (I) and (II) by 180^(@). They are represented as shown:
(I)
Now, compare I,II,III, and IV

(I) and (III)implies Enantiomers
(II) and (IV)implies Identical or same
Therefore, the pairs of diastereomers are:
(I), (II), (I), (IV) , and (II), (III)
But the answer given is (C ) (I, II).