The order of the magnitude of first ionisation potentials of $Be$,$B$,$N$ and $O$ is

Match the following List-$I$ and List-$II$ and select the correct answer using the codes given below.
List-$I$ (Successive Ionization Enthalpy) $\left( kJ \, mol^{-1} \right)$ List-$II$

Element	$IE_1$	$IE_2$	$IE_3$	Code	Element
$1$	$2080$	$3963$	$6130$	$(a)$	$H$
$2$	$520$	$7297$	$11810$	$(b)$	$Li$
$3$	$900$	$1758$	$14810$	$(c)$	$Be$
$4$	$800$	$2428$	$3660$	$(d)$	$B$
-	-	-	-	$(e)$	$Ne$

The ionization potential of sodium is $5.48 \ eV$. The $I.P.$ of potassium is ............. $eV$

Which of the following orders is correct for the property mentioned in brackets?

The correct order of first ionization enthalpy values of the following elements is:
$A. O$, $B. N$, $C. Be$, $D. F$, $E. B$
Choose the correct answer from the options given below:

Which of the following isoelectronic series would lose an electron most easily?