Decide whether the molecule 1 is R or S in the CIP system!
First stage: Its enantiomer is always found by exchanging two substituents of the atom C* → Let us exchange CH3 and H by creating the enantiomer 2 where the least important substituent in the CIP scale, namely H, is oriented towards the rear. Let us determine the configuration R or S of this enantiomer.
Second stage: What is → the configuration of the initial molecule 1 ?