There are three rules for assigning priorities:
Rule 1: A substituent atom of higher atomic number takes precedence over one of lower atomic number.
Rule 2: If two substituent atoms attached to the stereocenter have the same priority,the atom on the right of a hydrogen atom bonded to chiral carbon is a substituent of higher priority.
Rule 3: Double and triple bonds are treated as if they were single,and the atoms in them are duplicated or triplicated at each end by the particular atoms at the other end of the multiple bond.
Which rule(s)is/are stated incorrectly?
A)rule 2
B)rules 1 and 3
C)rule 3
D)rules 2 and 3
E)rules 1 and 2

Question

Quizplus · Accepted Answer

Rule 2 is incorrect because priority is determined by the atomic number of the atoms directly attached to the stereocenter, not by the position relative to a hydrogen atom.

There Are Three Rules for Assigning Priorities