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# Which of the following compound will exhibit geometrical isomerism.

(a) 1 - phenyl - 2 - Butene

(b) 3 - phenyl - 1 - Butene

(c) 2 - phenyl - 1 - Butene

(d) 1,1- Diphenyl - 1 - Propene

1 - phenyl - 2 - Butene will show geometrical isomerism because it has the two groups attached to $C=C$ bonded catoms which are different.
Hence a is the correct answer.