Which of these scenrios involve a reaction that is equilibrium?
a. the reaction is producing reactants and produces at an equal rate
b. the reaction is producing more reactants than products
c. the reaction is producing more products than reactants
d. the reaction is only producing products

The scenario that involves a reaction that is an equilibrium would be A. The chemical reaction is producing reactants and products at an equal rate.

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 

7is b8 is d9 is c10 is a11 is d