$KMnO_4$ will oxidise acetylene to

Which hydrocarbon reacts with sodium in liquid ammonia?

The reaction sequence is: $Br-(CH_2)_{12}-C\equiv CH$ $\xrightarrow{NaNH_2} (A)$ $\xrightarrow[Catalyst]{Lindlar} (B)$. The product $(B)$ is:

$CH_3-C \equiv CH \xrightarrow[(ii) H_2O_2/OH^{\Theta}]{(i) BH_3-THF} (P)$
$CH_3-C \equiv CH \xrightarrow[(ii) NaBH_4]{(i) Hg(OAc)_2/H_2O} (Q)$
Choose the correct option

Identify the major product $A$ in the following reaction sequence:
$CH_3-CH=CH-CH_3$ $\xrightarrow[CCl_4]{Br_2}$ $\xrightarrow[(ii) NaNH_2]{(i) alc. KOH} (A)$

Which reaction converts $2$-hexyne into $trans$-$2$-hexene?