Which of the following does not show geometrical isomerism?

Options

A. `1,4-`Dichlropent`-1-`ene
B. `1,1-`Dichlropent`-1-`ene
C. `1,3-`Dichlropent`-2-`ene
D. `1,2-`Dichlropent`-1-`ene

Answer

B

Explanation

`underset(1,1-"Dichloropent-1-en e")underset(CI)underset(|)(C1-overset(1)C=overset(2)CH)overset(3)CH_(2)overset(4)CH_(2)overset(5)CH_(3)`
This is compound does not show geometrical isomerism because it has two identical ligands (two `CI` atom) linked to (one of the double bond carbon atoms) `C-1`.
`underset(1,4-"Dichloropent-1-ene")(CI-CH=CHCH_(2)underset(CI)underset(|)CHCH_(2))underset(1,3-"Dichloropent-2-ene")(CICH_(2)CH=underset(CI)underset(|)(C CH_(2)CH_(3))`
`underset(1,2-"Dichloropent-1-ene")(CICH=underset(CI)underset(|)C CH_(2)CH_(2)CH_(3)`