Write a structural formula for the most stable conformation of each of the following compounds:

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) cis010isopropyl-3-methylcyclohexane

(d) trans-1-isopropyl-3-methylcyclohexane

(e) cis-1-tert-butyl-4-ethylcyclohexane

(f) cis-1,1,3,4-tetramethylcyclohexane