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how many geometrical isomers are there in

 

chloro nenzene

 

explain clearly

 

and also in 4-chloronitro benzene

 

of all ortho meta para types

 

explain from basic

 

first of all its not geometrical isomer. They differ in the position of functional group. So they are called positional isomer.
a) Chloro benzene has no isomer. As all the hydrogen of benzene are equivalent.
b) Nitrochloro benzene exist with three isomer. ortho, meta, para isomer.