Answer:
Acetylide,Enol, Aldehyde, Tautomers,Alkynes,Hydroboration,Keto.
Step-by-step explanation:
Acetylide anions are strong nucleophiles that open epoxide rings by an SN2 mechanism.
 Enol tautomers have an O-H group bonded to a C=C.
 Aldehyde are formed from terminal alkynes with the addition of water using BH3 then H2O2. 
Tautomers are constitutional isomers that differ in the location of a double bond and a hydrogen and exist in an equilibrium with each other.
Alkynes are compounds that contain a carbon-carbon triple bond. 
Hydroboration of a terminal alkyne adds BH₂ to the less substituted, terminal carbon. 
Keto tautomers have a C=O and an additional C-H bond.