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# Which of the following does not show geometrical isomerism ?

$(a)\;1,2-dichloro-1-pentene \\(b)\;1,3-dichloro-2-pentene\\(c)\;1,1-dichloro-1-pentene\\(d)\;1,4-dichloro-2-pentene$

Since it has two identical atoms (ie) $Cl$ and $C_1$