Which of the following C_6H_6 compounds has a | vedclass

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(B) To have a single set of structurally equivalent hydrogen atoms,all hydrogen atoms in the molecule must be chemically identical due to symmetry.$I$

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$I$ and $IV$

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(B) To have a single set of structurally equivalent hydrogen atoms,all hydrogen atoms in the molecule must be chemically identical due to symmetry.$I$ (Benzene): All $6$ hydrogen atoms are equivalent due to the resonance-stabilized hexagonal symmetry.$IV$ (Triafulvalene derivative/isomer): The structure shown is $1,3,5$-trimethylenecyclopropane (or similar isomer). In this highly symmetric structure,all hydrogen atoms attached to the terminal methylene groups are equivalent.$II$,$III$,and $V$ possess different types of hydrogen atoms (e.g.,bridgehead,vinylic,or methylene protons in different environments).Therefore,$I$ and $IV$ have a single set of structurally equivalent hydrogen atoms.

Which of the following $C_6H_6$ compounds has a single set of structurally equivalent hydrogen atoms? The structures are labeled $I$ to $V$ as shown in the image.

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