Q.
The absolute configuration of the following compound is :

NTA AbhyasNTA Abhyas 2022
Solution:
An absolute configuration of a compound is the spatial arrangement of the atoms in a chiral molecule and its stereochemical description is termed as $R$ or $S$, which refers to Rectus and Sinister, respectively.
At $C_{2}:\,\,\,\,\,\,\,\,\,\,\,\,\,\,$ At $C_{3}:$
Since least priority group is on horizontal position hence, $R$ becomes $S$.
$2 - S \,\,\,\,\,\,\ 3 -S$
At $C_{2}:\,\,\,\,\,\,\,\,\,\,\,\,\,\,$ At $C_{3}:$

Since least priority group is on horizontal position hence, $R$ becomes $S$.
$2 - S \,\,\,\,\,\,\ 3 -S$