Complete the following reactions:
$(1)$ $1$-Chloropropane $\xrightarrow[{KOH}]{{\text{ethanol}}} (B)$ $\xrightarrow[{CCl_4}]{{Br_2}} (C)$
$(2)$ Ethane $\xrightarrow[{hv}]{{Cl_2}} (B)$ $\xrightarrow[{Na, \text{ether}}]{} (C)$

(N/A) $(1)$ $1$-Chloropropane $(CH_3CH_2CH_2Cl)$ undergoes dehydrohalogenation with alcoholic $KOH$ to form propene $(CH_3CH=CH_2)$ as $(B)$. Propene then reacts with $Br_2$ in $CCl_4$ to form $1,2$-dibromopropane $(CH_3CHBrCH_2Br)$ as $(C)$.
$(2)$ Ethane $(CH_3CH_3)$ undergoes free radical chlorination in the presence of $hv$ to form chloroethane $(CH_3CH_2Cl)$ as $(B)$. Chloroethane then undergoes the Wurtz reaction with $Na$ in dry ether to form $n$-butane $(CH_3CH_2CH_2CH_3)$ as $(C)$.