Question

What is R configuration?

Answer 1

To call the enantiomers of a compound without ambiguity, their names must contain the molecule's "handedness." R/S nomenclature is the formal name for this procedure.
Although the sign of optical rotation differs for the two enantiomers of a chiral molecule at the same temperature, it cannot be used to determine an enantiomer's absolute configuration since the sign of optical rotation for a single enantiomer will change if the temperature increases.

Complete answer:
R shows that a clockwise circular arrow going from higher priority to lower priority crosses over the lowest priority substituent, which is in the back.
The R and S stereoisomers are non-superimposable mirror representations, which means that when they are reflected on a mirror plane, they do not become the same molecule.
The letters R and S are used to characterise the chirality center's structure. The term chirality centre refers to a carbon atom that has four distinct groups connected to it. To figure out if the chirality centre is R or S, you must first prioritise all four groups that are related to it. The molecule can then be rotated so that the fourth priority category is on a sprint (pointing away from you). Finally, decide whether the sequence 1-2-3 is counterclockwise or clockwise (R).

Note:
The letters R and S are used to characterise the chirality center's structure. The term chirality centre refers to a carbon atom that has four distinct groups connected to it. To figure out if the chirality centre is R or S, you must first prioritise all four groups that are related to it. The molecule can then be rotated so that the fourth priority category is on a sprint (pointing away from you). Finally, decide whether the sequence 1-2-3 is counterclockwise or clockwise (R).