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Draw a perspective formula for each of the following: a. (S)-2-chlorobutane b. (R)-1,2-dibromobutane
Figure given below shows structure of 2-chlorobutane. Greater the atomic number of atom bonded to the chiral carbon, higher is the priority. In -CH and -CHCH, C is bonded to (H,H,H) and (H,H,C) respectively. Cancel the common atoms; group with higher atomic number of uncommon atoms gets higher priority.
Order of priority :Cl CHCH CH H
For convenience, H is drawn with hatched wedge. Note that hatched and solid wedges should be next to each other. For S configuration, the arrow from Cl to CHCH to CH should be counterclockwise.
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