IUPAC name of tetra-tert-butyl methane is

The IUPAC name of the above compound is

In the above compound, if number of $3°$ carbon atoms is $\mathrm{X}$ and number of $4°$ carbon atoms is $\mathrm{Y}$, then $\mathrm{X}:\mathrm{Y}$ is

In the above reaction, the using reagents $\mathrm{X}$ and $\mathrm{Y}$ are: