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anions are strong nucleophiles that open epoxide rings by an sn2 mechanism. tautomers have an o-h group bonded to a c=c. are formed from terminal alkynes with the addition of water using bh3 then h2o2. are constitutional isomers that differ in the location of a double bond and a hydrogen and exist in an equilibrium with each other. are compounds that contain a carbon-carbon triple bond. of a terminal alkyne adds bh₂ to the less substituted, terminal carbon. tautomers have a c=o and an additional c-h bond.

Acetylide,Enol, Aldehyde, Tautomers,Alkynes,Hydroboration,Keto.

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.