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For elements B, C, N Li, Be, O and F, the correct order of first ionization enthalpy is :

1. Li < Be < B < C < O < N < F
2. B < Li < Be < C < N < O < F
3. Li < Be < B < C < N < O < F
4. Li < B < Be < C < O < N < F

Correct answer: Li < B < Be < C < O < N < F

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