Which among the following exhibit geometrical isomerism?wht they exhibit & y they dont?explain.choices r given?
Geometrical Isomerism arises due to fixed position of groups on adjacent carbon atoms joined together with a double bond. When the bond is single the carbon atoms can easily rotate individually and hence the position of the group attached to it is not fixed but when there is a double bond between two carbon atoms then the carbon atom cannot rotate freely hence causing fixed position of groups attached. For example the structure of 1-chloro-2-bromo ethylene is ……………..Cl………Br ……………… \……../ ………………. C = C Here the Cl and Br atoms are on the same side ……………… /……..\ of the carbon atoms. This is called “cis – ……………..H………H 1-chloro-2-bromo ethylene” However there is a possibility that the double bond breaks and the molecule rotate to ……………..Cl………H ……………… \……../ ………………. C = C This is called “trans- 1-chloro-2-bromo ……………… /………\ ethylene” because the Cl and Br
