Question

1. Construct a model that has a central carbon atom with 4 different colored spheres attached to it, representing four different atoms or groups. Draw a solid/dashed-wedge structure of this model here and answer the following questions. ç (a blue ball) IND Fig. 1 B a. Does the model have a plane of symmetry? Yes No The central carbon is said to be a stereocenter, stereogenic center, or chiral carbon. Change one of the colored spheres so that two of the four spheres are the same and examine the structure at different angles. b. Does the molecule now posses symmetry? What kind (plane, axis, etc.)? C. In view of your answers to a and b, what condition is necessary for a carbon to be stereogenic center? d. Draw a structural formula for each of the following and indicate all chiral carbons with an asterisk:

Answer 1

a). The No, the model does not have a plane of symetry, central carbon is said to be a Chiral carbon, (It is also a stereo centre). D A b) Yes, Now the SE will molecule Posses have plane of symetry. Symetry - e) The Carbon centre must have different substituents such that interchanging of any two substituents leads to a stereoisomer, & The molecule should posses a plane of gymetry. Interchanging of two groups will lead to mirror image. Be 14 d) 2- bromobutane Heter-c- + No chixal carbon. 3- bromopentane 3-bromopentane te- e - - C - CH Nochenende -chloropropane Br - Benz 1-bromo-2-chloropropane 2,3-dibero bubone - - 17