Which of the following Newman projections has the same conformations as the line-bond structure shown below? A) C) CI H CH3 CH3 H OH CH3 H H₂C H3C CI ОН CI OH B) H CI D) H3C H CH3 OH CH3 H OH H CI CH₂

A chair structure of a trisubstituted cyclohexane is shown below. Determine which of the following 2D representations matches the chair structure. CH3 CH3 H3C- CH3 A) I II CH3 CH3 CH3 B) I| CH C) II CH3 IV CH, CH3 CH3 D) IV

5. Convert the following structures into Newman projections viewing along the bond labeled as xy. Br CI7, X H HOEX y Br y X CI X y Br

Choose the Newman projection that best represents the following skeletal structure. Ш IV н CH3 H₂C CH р IV НС СН НС СН Н.С CH3 Η

Give typed explanation

Starting from the Newman projection below, rotate the back carbon to provide the structure in the least stable conformation. (H3C)₂HC H Q IX H^ H H CH3 o

What would the final structure look like after the electron motion shown with the arrows below? H3C-C-C=CH₂ H H H3C-C-C-CH3 H H H3C-C=C-CH₂ H H H H3C-C-C=CH₂ H H H3C-C=C-CH₂ H H

Consider the following Newman projections: CH3 CH3 H. CH3 H. H. CH3 H A В Which of the following statements is/are true? i) Newman projection A and B represent conformers of the same molecule. ii) In both conformers shown, A and B, there is no torsional strain. iii) Newman projection A shows the lowest energy conformer for that molecule. O i only O i and ii only O ii only O i and iii only O i, i and iii

Determine the absolute configuration of the asymmetric carbon of each compound below. H3C. H;C OH но HS HO NH2 NH2

Identify the most stable chair conformation of the most stable isomer of 1,4-diethylcyclohexane. II II IV | || II IV