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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.

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic