Assertion.. Diastereomers have different physical properties REASON.. They are non superimposable mirror images

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answer is 3as non superimposable mirror images are Enantiomers

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Enantiomers are non super imposable mirror image ....take tartaric acid and draw all 4 possible structure...(A,B,C,D) you can see that A-B and C-D are enantiomers....then A-C and B-D are diastereomers....their spatial arrangement  is totally different ,so you can't expect them to have same physical properties.....

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I found it quite easy but I don't know about others.

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No Gautam, mirror​ image of 'P' is also non superimposable. The mirror image of A is superimposabe. Getting the concept?

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Diastereomers and their Physical Properties:

Diastereomers are a type of stereoisomers that have different physical properties. This is because they possess different arrangements of atoms in space, resulting in distinct chemical and physical characteristics. The reason behind their different physical properties lies in their non-superimposable mirror image relationship.

Non-superimposable Mirror Images:
Diastereomers are molecules that have two or more stereocenters and differ in their configuration at some, but not all, of these stereocenters. When two molecules are non-superimposable mirror images of each other, it means that they cannot be overlaid perfectly, like a left and right hand. This non-superimposability arises due to the presence of chiral centers.

Explanation:
To understand why diastereomers have different physical properties, it is essential to consider their molecular arrangement and interactions. Here's a detailed explanation:

1. Molecular Structure: Diastereomers have different arrangements of atoms in space, resulting from their distinct stereoisomeric configurations. While they may have the same chemical formula and connectivity, the spatial orientation of functional groups differs. This variation in molecular structure contributes to the differences in physical properties.

2. Intermolecular Forces: Physical properties such as boiling point, melting point, solubility, and polarity are influenced by intermolecular forces. Diastereomers exhibit different intermolecular forces due to their distinct molecular arrangements. These variations in intermolecular forces affect the physical properties of diastereomers differently.

3. Steric Effects: Steric effects refer to the repulsion or hindrance caused by the spatial arrangement of atoms or groups around a molecule. Diastereomers often have different steric interactions due to their non-superimposable mirror image relationship. These steric effects can influence the physical properties of diastereomers, particularly in terms of shape, size, and reactivity.

4. Optical Activity: Diastereomers can exhibit different optical activities, which is the ability to rotate the plane of polarized light. The presence of chiral centers in diastereomers leads to a difference in their optical activity, which can be measured using a polarimeter. This difference in optical activity further contributes to variations in physical properties.

Conclusion:
Diastereomers have different physical properties because they possess unique arrangements of atoms in space, resulting in non-superimposable mirror image relationships. The variations in molecular structure, intermolecular forces, steric effects, and optical activity contribute to the differences observed in their physical properties. Understanding the impact of stereochemistry on physical properties is crucial in various fields, such as drug development, material science, and organic chemistry.

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Isn't there any one who can answer this

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I cannot spot my questions. And the same questions are being displayed alot.

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In this case, definitely wrong.

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U are right Jerry. I got confused between enantiomers and distereomers. It should be C

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A and B me confusion hai but both are correct.

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