Answer to Question #147403 in General Chemistry for S.SRI HARINI

Question

Assign E or Z configuration to the following compounds
(Ph stands for the phenyl group, C 6 H 5 )
H-CH3-CH3-OCH3

Answer 1

It is determined based on the priorities of the groups on the double bond:

To determine whether the higher priority group on each carbon is on the same or opposite side of the double bond. Since Cl and Br are pointing up and down, they are on opposite sides and the alkene has an E configuration:

: Z stands for Zame-they are on the zame side. This might be enough to figure out the E as well, however, you go with E as Epposite sides of the double bond.