Geometrical Isomerism

Geometrical isomerism is a type of stereoisomerism that occurs due to the restricted rotation of the double bond or ring structure. This results in the formation of two or more stereoisomers that have different spatial arrangements of their atoms.

Options Showing Geometrical Isomerism

A) Azomethane: Azomethane has a planar structure with a nitrogen atom and two methyl groups attached to it. The molecule has a double bond between the two nitrogen atoms. Geometrical isomerism is possible in azomethane due to the restricted rotation around this double bond.

B) 1-Bromo-2-Chloroethene: 1-Bromo-2-Chloroethene has a planar structure with a double bond between the carbon atoms. Geometrical isomerism is possible in this molecule due to the restricted rotation around this double bond.

C) 1-Phenylpropene: 1-Phenylpropene has a planar structure with a double bond between the carbon atoms. Geometrical isomerism is possible in this molecule due to the restricted rotation around this double bond.

Option Not Showing Geometrical Isomerism

D) 2-Methyl-2-butene: 2-Methyl-2-butene has a branched structure with a double bond between the carbon atoms. Geometrical isomerism is not possible in this molecule as there are no two different groups attached to the carbon atoms of the double bond.

Conclusion

In conclusion, options A, B, and C will show geometrical isomerism due to the restricted rotation around the double bond, whereas option D will not show geometrical isomerism as there are no two different groups attached to the carbon atoms of the double bond.

B