Question

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TODAYS QUESTION
WHAT is R-S CONFRIGRATION ?????

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Answer 1

The "right hand" and "left hand" nomenclature is used to name the enantiomers of a chiral compound. The stereocenters are labeled as R or S.

In order to assign the configuration as R or S:

Identify each of the chirality centers (most commonly an sp3 C with 4 different groups attached)  

Then at each chirality center....

Assign the priority (high = 1 to low = 4) to each group attached to the chirality center based on atomic number.

Reposition the molecule so that the lowest priority group is away from you as if you were looking along the C-(4) σ bond. If you are using a model, grasp the lowest priority group in your fist.

Determine the relative direction of the priority order of the three higher priority groups (1 to 2 to 3)

If this is clockwise then it is the R-stereoisomer (Latin; rectus = right handed)  

If this is counter-clockwise then it is the S-stereoisomer (Latin; sinister = left handed)  

If there is more than one stereocenter, then the location needs to be included with the locant, e.g. (2R)-

Answer 2

Mass can neither be created nor be destroyed. It can be converted from one form to another