identify reagents that can be used for the following synthesis: 1) h2, pt; 2) br2, hv ; 3) naoet 1) h2, lindlar's catalyst; 2) br2, hv ; 3) t-buok 1) na, nh3(liq); 2) br2, hv ; 3) naoet 1) h2, pt; 2) br2, hv ; 3) t-buok