Answer:
Molecule #1 ( sobrerol )
Center a: R
Center b: S
Molecule #2 ( pulegone )
Center a: none
Center b: R
Explanation:
The lowest priority group is curved the clockwise configuration of molecule is referred to as S and anti clockwise configuration is R. The absolute configuration of chiral center is defined by Cahn-ingold-Prelog rules. The sobrerol has center a as R configuration and center b as S configuration. The center a configuration of pulegone is none.