Which of the following does not show geometrical isomerism?
1,2-dichloro-1-pentene
1,3-dichloro-2-pentene
1,1-dichloro-1-pentene
1,4-dichloro-2-pentene.
As we learnt ,
1,1-dichloro-1-pentene
There is no possibility of cis and trans isomers as carbon has both Cl group at 1 - position.