Question

Assign the configuration as E or Z to the following compounds:iS C Cl ClH2C COOH H

Answer 1

Z isomer because of the highest priority on the same side of double bond.

Atoms of higher nuclear number gets priority for example groups are positioned in diminishing nuclear number / atomic number of atom by which they are attached to asymmetric carbon particle .  

I>Br>Cl>O>N>C>H  

Multiple bonds are treated as isolated single bonds.  

I > Br > Cl, OH> NO2 > NH2 > COOH > CHO > CH2OH