In the Newman projection for 2,2-dimethylbutane X and Y can...

Conformation projection along $\mathrm{C}_1-\mathrm{C}_2\mathrm{C}_1$ contains all three $\mathrm{Hs}$ So, $\quad X=\mathrm{H}$
$\mathrm{C}_2$ contains two methyl and one ethyl group So, $\quad Y=\mathrm{C}_2 \mathrm{H}_5$ Conformational projection along $\mathrm{C}_{2}- \mathrm{C}_{3} \mathrm{C}_2$ contains three methyl groups $\left(\mathrm{C}_2\right.$ form back carbon in the given structure) So, $\quad Y=\mathrm{CH}_3<img src="/api/proxy-image?url=https$ \\ $\mathrm{C}_3$ contains two Hs and one methyl group $\left(\mathrm{C}_3\right.$ form front carbon in the given structure) So, $\quad X=\mathrm{CH}_3\mathrm{C}_3$ contains two Hs and one methyl group $\left(\mathrm{C}_3\right.$ form front carbon in the given structure) So, $\quad X=\mathrm{CH}_3$ Isomerism (Stereochemistry) Conceptual (Structural visualisation) III