JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Para hydrogen is:

(A)Less stable than ortho hydrogen
(B)More stable than ortho hydrogenCorrect
(C)As stable as ortho hydrogen
(D)None of the above

Answer: (B)

Solution

Ortho- and para-hydrogen differ in their lowest allowed rotational energy level: para-hydrogen's ground state is , while ortho-hydrogen's lowest allowed state is , which lies at higher energy. Because para-hydrogen occupies the true rotational ground state, it is the thermodynamically more stable form, and

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Question ID VK-137348