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Given below are two statements : One is labelled as Assertion A and other is labelled as Reason R. Assertion A : The dihedral angles in H2O2 in gaseous phase is 90.2° and in solid phase is 111.5°. Reason R : The change in dihedral angle in solid and gaseous phase is due to the difference in the intermolecular forces. Choose the most appropriate answer from the options given below for A and R.

1. A is correct but R is not correct.
2. Both A and R are correct but R is not the correct explanation of A.
3. Both A and R are correct and R is the correct explanation of A.
4. A is not correct but R is correct.

Correct answer: Both A and R are correct but R is not the correct explanation of A.

Solution

The assertion about the dihedral angles of H2O2 in different phases is accurate, as these angles do vary between gaseous and solid states. However, the reason provided does not directly explain this phenomenon, as the change in dihedral angle is influenced by factors beyond just intermolecular forces, such as molecular packing and geometry.

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