Question

Rank the set of substituents below in order of priority according to the Cahn-Ingold-Prelog sequence rules. W-C-CH_BW=CHCH. Dw-cios b o (a) —C=CH (b) -CH=CH2 (c) —C(CH3)3 (d)

Answer 1

ACCORDING TO THE CIP RULES THE PRIORITY ORDER OF FOLLOWING GROUP WILL BE

A) 2

B) 4

C) 3

D) 1

IT INVOLVES THE USE OF THE RULE

If an atom A is double-bonded to an atom B, A is treated as being singly bonded to two atoms: B and a "ghost atom" that is a duplicate of B (has the same atomic number) but is not attached to anything except A. When B is replaced with a list of attached atoms, A itself, but not its "ghost", is excluded in accordance with the general principle of not doubling back along a bond that has just been followed. A triple bond is handled the same way except that A and B are each connected to two ghost atoms of the other