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For the second period elements the correct increasing order of first ionisation enthalpy is:

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

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

Solution

The correct order is based on periodic trends and exceptions. Ionization enthalpy generally increases across a period, but Be > B and N > O due to electronic configurations. Option B reflects this correctly.

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