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The correct order of first ionization enthalpy values of the following elements is : (A) O (B) N (C) Be (D) F (E) B Choose the correct answer from the options given below :

1. B < D < C < E < A
2. E < C < A < B < D
3. C < E < A < B < D
4. A < B < D < C < E

Correct answer: E < C < A < B < D

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