Draw the two chair conformers of each compounds and inicate which conformer is more stable .
(a) cis-1-ethyl-3-methylcyclohexane
(b) trans-1-ethyl-2-isopropylcyclohexane
(c)trans-1-ethyl-2-methylcylcohexane
(d) trans-1-ethyl-3-methylcyclohexane
(e) cis-1-ethyl-3-isopropylcylcohexane
(f) cis -1-ethyl-4-isopropylcyclohexane.
A. 54
B. 55
C. 56
D. 57
