Question
What is the relationship between the members of following pairs of structures? Are they structural or geometrical isomers or resonance contributors?

Answer

Compounds having the same molecular formula, the same constitution, and the sequence of covalent bonds, but with different relative position of their atoms in space are called geometrical isomers.

In structures I and II, the relative position of Deuterium (D) and hydrogen (H) in space are different. Hence, the given pairs represent geometrical isomers.

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