Answer:
Correct answers: 2 and 3
Explanation:
1- correct would be: Isolation of ibuprofen is not dangerous, but it is necessary because only one enantiomer has effect on interaction with biologic diana
2: Correct! This property of diastereomeric salts (differing solubilities) is really useful for the isolation of the original enantiomers
3: Correct! we can only observe their properties, like polirized light rotation or separation in an assimetric column for chromatography.
4: correct would be: diastereomeric salts do not rotate light, they have lost the property of anantiomers that originated them