$$ \text { Match the following. } $$

$$ \text { List-I } $$		$$ \text { List-II } $$
A	$$ \text { Ionisation enthalpy } $$	I	$$ \mathrm{P}<\mathrm{Si}<\mathrm{Mg}<\mathrm{Na} $$
B	$$ \text { Metallic character } $$	II	$$ \mathrm{I}<\mathrm{N}<\mathrm{O}<\mathrm{F} $$
C	$$ \text { Electron gain enthalpy } $$	III	$$ \mathrm{B}<\mathrm{Be}<\mathrm{C}<\mathrm{O}<\mathrm{N} $$
D	$$ \text { Electronegativity } $$	IV	$$ \mathrm{l}<\mathrm{Br}<\mathrm{F}<\mathrm{Cl} $$

Which of the following oxides is acidic in nature?

If the first ionisation enthalpy of $\mathrm{Li}, \mathrm{Be}$ and C respectively are $520,899,1086 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The first ionisation enthalpy (in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) of B will be

Match of following.

List I (Element)	List II (Electron gain enthalpy (in $\mathrm{kJ} \mathrm{mol}^{-1}$ )
A F	I -141
B Cl	II -328
C O	III -200
D S	IV -349

The correct answer is