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Question

The absolute configurations of the two centers in the following molecule are :

A
2(R),3(S)
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B
2(R),3(R)
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C
2(S),3(S)
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D
2(S),3(R)
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Solution

The correct option is A 2(R),3(S)
R configuration is when the decreasing priority order of groups are found in clockwise direction. If it is anticlockwise, it is S. It is applicable when least prior group(usually it is H atom) is below the plane. But if the least prior group is above the plane(as shown below), we should check incresing order and if it is clockwise, it is R otherwise S.

Hence, (a) is correct.

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