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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 and R is the correct explanation of A.

Solution

The dihedral angle of H2O2 is 90.2 deg in the gas phase and 111.5 deg in the solid phase; both values are standard. The phase-dependent change arises because intermolecular forces (notably H-bonding in the solid) differ between phases, so R correctly explains A. Both A and R are correct and R IS the correct explanation.

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