Question

Three-dimensional shape of CHFBCI and its mirror image. Optical activity: Yes No Three-dimensional shape of the isomers of C2H4BrF Structure: Optical activity: No a) No Mes

Answer 1

1) F. R C . H i H . S Bri The central carbon is attached to four different atoms and hence it is chiral carbon. As the molecule consist of chiral carbon and there is no internal plane of symmetry present in the molecule, it shows optical activity. R and S are the absolute configurations of these optical isomers. They are non-superimposable mirror images of each other and hence they are enantiomeric pair. Optical activity: Yes! 2) F. SCH HR HC Br Br" CH3 C2H4BF a) The central carbon is attached to four different atoms and hence it is chiral carbon. As the molecule consist of chiral carbon and there is no internal plane of symmetry present in the molecule, it shows optical activity. They are also enantiomeric pair. Optical activity: Yes!

Br HH C- C Hн Е b) The second isomer of C2H4BrF is shown as above. Each carbon is attached to at least two protons and hence the compound does not have any chiral center and so it is not a chiral compound Achiral compounds do not show any optical activity. Hence optical activity of isomer-b: No!