need help with these organic chemistry questions please

b. Draw Newman depictions that correspond to the followingconformations:[) The last stable conformation of 3-methylnonane along the C-4-C-5bond.") The most stable conformation of 1,1-dibromo-6-chlorohexane alongthe C-3 - C-4 bond."il) A gauche conformation for 5-methyl-heptan-2-ol along the C-3 - C-4 bond.[15%]C. In the molecules below, indicate which is more stable and then give abrief explanation for your choice.BrBrBrBrVS