A) Diastereomers have different melting points and solubilities in a given solvent.
B) Diastereomers have similar chemical properties.
C) Diastereomers are optically active compounds with same or opposite sign of rotation.
D) Diastereomers differ in adsorption.
Correct Answer: C
Solution :
[c] (1) is true, (2) is true, and (4) is true. (Adsorption is a physical property. So it is different for diasteroemers.) (3) is not true. Diastereomers can be optically inactive, e.g., cis-2- butene and trans-2-butene are geometrical isomers and are diastereomers. Similarly, gauche and anti-forms are not optically active and are conformers and diastereomers.
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