In which of the following,elements are correctly arranged in the decreasing order of their second ionisation enthalpies?

Given below are two statements $:$
Statement $(I) :$ The first ionisation enthalpy of group $14$ elements is higher than the corresponding elements of group $13.$
Statement $(II) :$ Melting points and boiling points of group $13$ elements are in general much higher than those of the corresponding elements of group $14.$ In the light of the above statements,choose the most appropriate answer from the options given below $:$

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:

The correct order of second $I.E.$ of $C$,$N$,$O$,and $F$ is:

The first ionization potentials $\left( eV \right)$ of $Be$ and $B$ respectively are:

Find the formula of the halide of a metal whose successive ionization energies are $10, 16, 25, 400, 500 \ eV \ mol^{-1}$ respectively $:-$