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Question


What is the absolute configuration of the given chiral carbon?

A
R
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B
S
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C
Both
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D
None
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Solution

The correct option is B S
The given compound is in Fischer projection. To assign absolute configuration priority for the group should be given according to their atomic number/mass.
Here, OH is the first priority group and Et is second priority group, Me is third priority group. H is fourth priority.
Here the least priority (H) is in vertical position. So the direction from 1 to 3 is anticlockwise. Hence, the absolute configuration of given chiral carbon is 'S'

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