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Correct order of first IP among following elements Be, B, C, N, O is:

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

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

Solution

The correct order is based on periodic trends and exceptions. Be has a higher ionization potential than B due to its stable fully-filled 2s orbital. N has a higher ionization potential than O due to its half-filled p-orbital stability. Thus, the order is B < Be < C < O < N.

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