When considering le chätelier's principle and the factors that affect chemical equilibrium, which of the following is not true?
a. increasing the concentration of reactants shifts the equilibrium position to the right.
b. decreasing the volume of a system shifts the equilibrium position to the left.
c. changing the concentration and volume does not always change the equilibrium constant in a reaction.
d. changing the temperature alters both the equilibrium constant and position.

When considering Le Chatelier's Principle and factors that affect chemical equilibrium, the answer that is not true would be: Decreasing the volume of a system shifts the equilibrium position to the left. 

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