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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

Correct answer: 1 – Phenyl – 2 - butene

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