A) all three compounds are chiral
B) only I and II are chiral
C) I and III are diastereomers
D) only I and III are chiral
Correct Answer: D
Solution :
2-R, 3-R configuration, so it is a chiral compound. 2-R, 3-S configuration, i.e., it has plane of symmetry or in other words, rotation of half part is cancelled by the other half, so it is not a chiral compound. 
2-S, 3-S configuration, so it is also a chiral compound.
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