1.

The absolute configuration of:

Answer»

(2R,3S)
(2S,3R)
(2S,3S)
(2R,3R)

Solution :.
At C-2
Without changing the position of `NH_(2)` group, rotate the remaining atoms/groups in ANTICLOCKWISE DIRECTION.

At C-3
REPEAT the same proceduct in this CASE also
.


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