Question

Explain the difference between chiral and achiral molecules.

Identify the chirality centers in a molecule.

Classify a given set of molecules as either enantiomers or diastereomers.

Name R and S enantiomers when given a 3D perspective formula or vice versa. ( this would include assigning or drawing the R or S enantiomer using the Cahn-Ingold-Prelog Notational System)

Give a general description of the purpose and the function of a polarimeter.

Be able to differentiate the meanings of observed rotation and specific rotation.

Be able to compare the physical properties of enantiomers to those of diastereomers

Discuss the similarities and differences among the symbols R, S, d, l, (+), and (-) as applied to stereoisomers. ( Note: you should recognize that either dl or ± is the symbolism used for a racemate. )

Discuss the nature of optical activity as its relates to racemates and meso compounds .

Evaluate a Fischer projection of a molecule to determine the D/L and R/S configurations . ( This includes being able to draw the perspective formula of the molecule from the Fischer projection or vice versa)

Answer 1

ANS) A molecule is said to be chiral molecule if it is surrounded by four different atoms or if it doesnot have any syymentry.

A molecule is said to be Achiral molecule if it contains symmetry or surrounded by any one of the same atoms.

ENANTIOMERS: there are the molecules whose mirror images are exactly the same with the original molecules

DIASTEREOMERS: thes are the molecules whose mirroe image is not the same as the original one .

If a molecule posses clockwise atomic arrangement around the chiral carbon after allocting the priority numbers to the atoms ,then that molecule is said to have R configaration, if it is anti clockwise then it is S configaration.