$$ \text { The IUPAC name of the following compound is } $$

When $\mathrm{CH}_3 \mathrm{Br}$ and $\mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}$ are subjected to Wurtz reaction, the maximum number of possible alkane product(s) formed is/are

Maximum number of bromine atoms present in the final product $P$ upon complete bromination are

A cubic structure is formed where atoms of element $X$ are occupied at corner of cube and also at face centers. Atoms of element $Y$ are present at body center and at the edge centers. If all the atoms are removed along a plane passing through the middle of the cube (bisecting the four edges), the formula will become