Match the structures given in Column $I$ with their $IUPAC$ names in Column $II$.

Column $I$ (Structure)	Column $II$ ($IUPAC$ Name)
$(A)$ $CH_3-CH=CH-CH_2Br$	$(p)$ $1$-Bromobut-$2$-ene
$(B)$ $CH_2=C(CH_3)-CH_2Br$	$(q)$ $3$-Bromo-$2$-methylpropene
$(C)$ $CH_3-C(CH_3)=CH-CH_2Br$	$(r)$ $4$-Bromopent-$2$-ene
$(D)$ $CH_3-CH=CH-CH_2CH_2Br$	$(s)$ $1$-Bromo-$2$-methylbut-$2$-ene

(A-P, B-Q, C-S, D-R) The $IUPAC$ names are determined by identifying the longest carbon chain containing the double bond and assigning the lowest possible locants to substituents and the double bond.
$(A)$ $CH_3-CH=CH-CH_2Br$: Longest chain is $4$ carbons,double bond at $C-2$,bromo at $C-1$. Name: $1$-Bromobut-$2$-ene $(p)$.
$(B)$ $CH_2=C(CH_3)-CH_2Br$: Longest chain is $3$ carbons,double bond at $C-1$,methyl at $C-2$,bromo at $C-3$. Name: $3$-Bromo-$2$-methylpropene $(q)$.
$(C)$ $CH_3-C(CH_3)=CH-CH_2Br$: Longest chain is $5$ carbons,double bond at $C-2$,methyl at $C-2$,bromo at $C-1$ (Wait,re-evaluating: $CH_3-C(CH_3)=CH-CH_2Br$ is $1$-bromo-$2$-methylbut-$2$-ene). Let's re-check the options.
Correct mapping:
$(A) \rightarrow (p)$ $1$-Bromobut-$2$-ene
$(B) \rightarrow (q)$ $3$-Bromo-$2$-methylpropene
$(C) \rightarrow (s)$ $1$-Bromo-$2$-methylbut-$2$-ene
$(D) \rightarrow (r)$ $4$-Bromopent-$2$-ene
Final matching: $(A-p, B-q, C-s, D-r)$.