Question
Which of the following does not show geometrical
isomerism?
A.
1, 2 - dichloro - 1 - pentene
B.
1, 3 - dichloro - 2 - pentene
C.
1, 1 - dichloro - 1 - pentene
D.
1, 4 - dichloro - 2 - pentene
Answer :
1, 1 - dichloro - 1 - pentene
Solution :

does not show
geometrical isomerism due to presence of two similar $$Cl$$ atoms on the same $$C-$$ atom. Geometrical isomerism is shown by compounds in which the groups/atoms attached to $$C = C$$ are different.