In the following structure, the double bonds are marked as $I, I I, I I I$ and $I V$ .
Geometrical isomerism is not possible at site (S):

I I I

and

I V

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I

and

I I I

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I I I

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I

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Solution

The correct option is D $I$
Geometrical isomerism is not possible at site $I$ as two identical $m e t h y l$ groups are attached to same $C$ atom bearing double bond.

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In the following structure, the double bonds are marked as I,II,III and IV.Geometrical isomerism is not possible at site (S):

The correct option is D IGeometrical isomerism is not possible at site I as two identical methyl groups are attached to same C atom bearing double bond.

In the following structure, the double bonds are marked as $I, I I, I I I$ and $I V$ .
Geometrical isomerism is not possible at site (S):

The correct option is D $I$
Geometrical isomerism is not possible at site $I$ as two identical $m e t h y l$ groups are attached to same $C$ atom bearing double bond.