Q. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The first ionization enthalpy of O is lower than that of N and F. Reason R: The loss of an electron from O leads to stable half-filled p orbital In light of the above statements, choose the most appropriate answer from the options given below:
A) A is not correct but R is correct
B) Both A and R are correct and R is the correct explanation of A
C) Both A and R are correct but R is NOT the correct explanation of A
D) A is correct but R is not correct.
Explanation
[Solution from source] Oxygen (2p⁴) has one doubly occupied 2p orbital; removing a paired electron relieves repulsion and leaves O⁺ with a stable half-filled 2p³ configuration, so its first ionization enthalpy is lower than that of N and F. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.