Give the `IUPAC` name of the alkene

Options

A. `Z-3-`Methyl`-4-`propyloct`-3-`ene
B. `E-3-`Methyl`-4-`propyloct`-3-`ene
C. `E-4-`Butyl`-3-`Methylhept`-3-`ene
D. `E-2-`Ethyl`-3-`propylhept`-2-`ene

Answer

A

Explanation

It is not practical to identify cis and trans isomers when the four ligands on `C =C` are different. The letter `Z` is used when the two high-priority substituents are on the same side of the double bond and the letter `E` is used when theyr are on opposite sides (from the German: zusammen,together and entgegen,opposite).

`CH_(3)CH_(2) gt CH_(3)`
`underset(Z-3-"Methy1-4-pr opyloct-3-ene")(CH_(3)CH_(2)CH_(2)CH_(2) gt CH_(3)CH_(2)CH_(2)`