Which of the following is a Newman projection of a staggered conformation for propane?

Which of the following structures is the correct wedge/dash drawing of the following Fischer projection?

Rank the conformers of 1,2,4-trimethylcyclohexane in order of decreasing stability, putting the most stable first.  

Which structure is an enantiomer of following shown?

Identify the isomer of C9H20 that is the most stable?

Which of the following is the lowest energy chair conformation of the following cyclohexane?

What is the correct order of the Cahn-Ingold-Prelog ranking of the following substituents as used in assigning R and S configurations of chiral centers? (lower ranking < higher ranking) ​ 1. −CH2OH 2. −CHO 3. −OCH3 4. −OCOCH3 ​

Which of the following is the correct Newman projection for the following compound showing the gauche conformation?

Identify the correct chair conformation of cyclohexane showing all of the equatorial hydrogen atoms.

Which of the following are constitutional isomers?I. 2,3,3-trimethylhexaneII. 3,3-diethylpentaneIII. 3-ethyl-2-methylheptane