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Consider the energy diagram showing the conformational analysis of propane and match the indicated position with the correct confirmation below.

Which arrow(s) indicates the chiral center(s) in the compound shown?

Which of the following molecules are chiral?  

Select the word that will best complete the following sentence: (atomic, electronegativity, isomers, sp, sp2, sp3, stronger, weaker, Pi, sigma, hybridization, inductive, resonance, conjugated base, conjugated acid, higher, lower, active, electrophilic, nucleophilic, hydrophobic, hydrophilic, reactive, axial, conformations, equatorial, stereoisomers, steric, torsional, angle, alkanes, cycloalkanes, ring flip, element.)   The anti conformation is ………. in energy than the gauche conformation. Complete word/phrase and correct spelling (verbatim) is required. No partial credit.

How many stereogenic centers (chirality centers) are present in ephedrine, a bronchodilator and decongestant?  

How many stereogenic centers (chirality centers) are present in the following molecule?

Which of the following is a CH3—CH3 eclipsed conformation for butane?

Which of the following is a CH3-H eclipsed conformation for butane?

Identify the highest energy conformation of butane as a Newman projection looking down the C2-C3 bond.

How many stereogenic centers (chirality centers) present in the following compound?