Relation between $(X)$ and $(Y)$ is
enantiomers
diastereomers
$X$ and $Y$ isomer
constitutional isomer
Optically inactive compound is
Total number of stereoisomers of the compound $1-$ bromo $-3-$ chloro cyclobutane
$2$-chlorobutane $+\mathrm{Cl}_2 \rightarrow \mathrm{C}_4 \mathrm{H}_8 \mathrm{Cl}_2$ (isomers)
Total number of optically active isomers shown by $\mathrm{C}_4 \mathrm{H}_8 \mathrm{Cl}_2$, obtained in the above reaction is......................
Compound$(s)$ that on hydrogenation produce$(s)$ optically inactive compound$(s)$ is (are)
The given pair are