Select the correct answer for the reactions below$\mathrm{.}2-$butyne reacts with$1)$ Na $/$ NH$3($l$),-78$oC$2)$ H$2/$ Pd$/$C$3)$ Br$2/$ light$4)$ tert$-$butoxide $1-$butene $2-$bromobutane $1-$bromobutane$2-$butene