The structure of H2O2 molecule is:
Linear
Closed book like
Half-open book like
Cyclic
The molecule can be pictured as lying on the spine of a book open to an angle of 94o. The hydrogen atoms are present one on each cover and H-O bonds making angles of 97o with the O-O bond as shown in the figure given below
The structure of H2O2 is slightly different in the gas phase and crystalline phase.
So, "Half-open book like" will be correct.
Therefore, Option(3) is correct
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