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

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$Li < Be < B < C < N < O < F$

$B > Li > Be > C > N > O > F$

$Li < B < Be < C < O < N < F$

$Li < Be < B < C < O < N < F$

answer is C.

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Detailed Solution

First ionization enthalpy increases across a period. Be is stable with 2s² (fully filled s-subshell) and N is stable with 2p³ (half-filled p-subshell). So, they are more stable than the immediate next members.

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