Which among the following compounds will show geometrical isomerism

1. $\mathrm{C}{\mathrm{H}}_3–\mathrm{C}\mathrm{H}=\mathrm{C}{\mathrm{H}}_2$
2. 
3. 
4. $\mathrm{C}{\mathrm{H}}_3–\mathrm{C}\mathrm{H}=\mathrm{C}\mathrm{H}\mathrm{D}$

Solution

As for geometrical isomerism, both substiuents on each doubly bonded carbon should be different so only $\mathrm{C}{\mathrm{H}}_3–\mathrm{C}\mathrm{H}=\mathrm{C}\mathrm{H}\mathrm{D}$ can show geometrical isomerism. Rest other do not show G.I. as they have same species on same double bonded carbon. For e.g.
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Asked in: JEE-TOPICTESTS-CHEMISTRY

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