Question

3. Diastereomers and Meso Forms. When a molecule has two or more stereogenic centers, stereoisomers that are not mirror images can exist; these are called diastereoisomers. Within this general class, there are special types of stereoisomers that are always optically inactive and are called meso forms. Construct a model with four different colored balls about a carbon center. Construct another identical to the first and verify this by the superimposition test. Now remove the same colored balls, blue (C from Fig 1) for example, from each model and join the two carbons at the vacant valence sites as shown in Fig 2. D DU Fig 2 a. How many stereogenic carbons does this model have? Note that each carbon has the same four groups attached to it. b. Conformationally adjust (by rotation about the central C-C bond) the model in a Search for symmetry. Does the molecule have a plane of symmetry? Yes_ No_ Construct the mirror image of this molecule. Are the mirror images identical? Yes No d. What term is used to describe the relationship between the two molecules in 3c? c. unming each of these models to determine whether they are chiral or achiral.

Answer 1

Soln brium model. 3. Dlastereomers and Meso Forms. When a molecule has two or more stereogenic centers, stereoisomers that are not mirror Images can exist; these are called dlastereoisomers. Within this general class, there are special types of stereoisomers that are always optically inactive and are called meso forms. Construct a model with four different colored balls about a carbon center. Construct another identical to the first and verify this by the superimposition test. Now remove the same colored balls, blue (C from Fig 1) for example, from each model and join the two carbons at the vacant valence sites as shown in Fig 2. B OAS Rotate Fig 2 a 2 stereogenic centers. How many stereogenic carbons does this model have? Note that each carbon has the same four groups attached to it_2 Conformationally adjust (by rotation about the central C-C bond) the model in a search for symmetry. Does the molecule have a plane of symmetry? Yes No Construct the mirror image of this molecule, c Are the mirror images identical? Yes No d. Wyat term is used to describe the relationship between the two molecules in 3c? canantiomors.) Elamine ench of these models to determine whether they are chiralonachiral Jy mumistry (0.5) 6) No, molesl dovestea potame of Morror image of medicale Mirror ID

to be identical e - Mirror image are not identical. Because a molecule it should have two conditions satisfied 1 is Mirror image v ii) Plane of symmetry X Relationship b/w these moleculy ý Enantiomers. d
According to rules and regulations , only first four subparts can be answered . Thank you....