Which sequence of reagents works best to convert 3-hexene to 3-hexyne?
HCl2.NaNH_(2)
Cl_(2),CH_(2)Cl_(2)
2. NaCN (excess)
NaNH_(2)
2. HI 3.
H_(3)O^( )
BH_(3)
. THF 2.
HO^(-),H_(2)O_(2)
3.
Br_(2),CH_(2)Cl_(2)
2.
(excess)