Use these statements about valence electrons to answer the question.

1.all valence electrons are used to form bonds with other atoms or ions.
2.bonding electrons are represented by a single dot in an electron dot diagram.
3.when two electrons occupy the same valence orbital of an atom, they form a lone pair of electrons.
4.the last digit of a group number represents the number of valence electrons in the representative elements.

the true statements are

select one:
a. 1, 2, and 3
b. 1, 2, and 4
c. 1, 3, and 4
d. 2, 3, and 4

 the answer is d. 2, 3, and 4 because 1 is already checked off

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 

Exothermic,  physical change after it is already baked