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Draw (2R, 3S) 2-bromopentan-1,3-diol in a Fischer projection.

Draw (2R, 3S) 2-bromopentan-1,3-diol in a Fischer projection.

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Answer #1

Give priority to all the 4 bond attached to chiral centre.

To decide R or S
If 4th priority bond is into the plane and 1-2-3 rotate clockwise ---> R
If 4th priority bond is into the plane and 1-2-3 rotate counter clockwise ---> S

If 4th priority bond is Not into the plane and 1-2-3 rotate clockwise ---> S
If 4th priority bond is Not into the plane and 1-2-3 rotate counter clockwise ---> R

For fischer Projection: Always for a Fischer, the groups pointing on the side are coming out of the page.

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