Write a structural formula for the most stable conformation of each of the following compounds: (a) 2,2,5,5-Tetramethylhexane

Question:

Write a structural formula for the most stable conformation of each of the following compounds:
(a) 2,2,5,5-Tetramethylhexane (Newman projection of conformation about C-3-C-4 bond)
(b) 2,2,5,5-Tetramethylhexane (zigzag conformation of entire molecule)
(c) cis-1-Isopropyl-3-methylcyclohexane
(d) trans-1-Isopropyl-3-methylcyclohexane
(e) cis-1-tert-Butyl-4-ethylcyclohexane
(f) cis-1,1,3,4-Tetramethylcyclohexane
(g)