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(B) The molecular formula $C_5H_9Cl$ indicates a degree of unsaturation of $2$. $X$ is $3$-chloropent-$1$-ene $(CH_3CH_2CH(Cl)CH=CH_2)$,which is optic

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$3-$chloropent$-1-$ene and $4-$chloropent$-1-$ene

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(B) The molecular formula $C_5H_9Cl$ indicates a degree of unsaturation of $2$. $X$ is $3$-chloropent-$1$-ene $(CH_3CH_2CH(Cl)CH=CH_2)$,which is optically active due to the chiral center at $C_3$. Upon hydrogenation with $1 \ mole$ of $H_2$,$X$ forms $3$-chloropentane $(CH_3CH_2CH(Cl)CH_2CH_3)$,which is optically inactive $(Z)$ due to the presence of a plane of symmetry. $Y$ is $4$-chloropent-$1$-ene $(CH_2=CHCH_2CH(Cl)CH_3)$,which is also optically active due to the chiral center at $C_4$. Upon hydrogenation with $1 \ mole$ of $H_2$,$Y$ forms $2$-chloropentane $(CH_3CH_2CH_2CH(Cl)CH_3)$,which is still optically active $(P)$ because the chiral center at $C_2$ remains intact. Thus,$X$ is $3$-chloropent-$1$-ene and $Y$ is $4$-chloropent-$1$-ene.

Column-$I$	Column-$II$
$(A)$ Carbocation	$(1)$ Cyclohexane and $1$-hexene
$(B)$ Nucleophile	$(2)$ Conjugation of electrons of $C-H$ $\sigma$-bond with empty $p$-orbital present at adjacent positively charged carbon
$(C)$ Hyperconjugation	$(3)$ $sp^{2}$ hybridised carbon with empty $p$-orbital
$(D)$ Isomers	$(4)$ Ethyne
$(E)$ $sp$ hybridisation	$(5)$ Species that can receive a pair of electrons
$(F)$ Electrophile	$(6)$ Species that can supply a pair of electrons

List-$I$ (Pair of Compounds)	List-$II$ (Isomerism)
$A$. $n$-propanol and Isopropanol	$(I)$ Metamerism
$B$. Methoxypropane and ethoxyethane	$(II)$ Chain Isomerism
$C$. Propanone and propanal	$(III)$ Position Isomerism
$D$. Neopentane and Isopentane	$(IV)$ Functional Isomerism

$X$ and $Y$ are optically active isomers having the molecular formula $C_5H_9Cl$. When treated with one mole of $H_2$,$X$ gets converted to an optically inactive compound $Z$,but $Y$ gives an optically active compound $P$. The structures of $X$ and $Y$ respectively are:

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