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Which of the following compounds will exhibit geometrical isomerism? (1) 1 - Phenyl - 2 - butene (2) 3 - Phenyl - 1 - butene (3) 2 - Phenyl - 1 - butene (4) 1, 1 - Diphenyl - 1 - propane

1. 1 - Phenyl - 2 - butene
2. 3 - Phenyl - 1 - butene
3. 2 - Phenyl - 1 - butene
4. 1, 1 - Diphenyl - 1 - propane

Correct answer: 1 - Phenyl - 2 - butene

Solution

1-Phenyl-2-butene has a double bond between the second and third carbon atoms, allowing for different spatial arrangements of the substituents around the double bond, which is the basis for geometrical isomerism. The other options either lack a double bond or do not have the necessary substituents to create distinct isomers.

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