Author: Anonymous

What is the appropriate IUPAC name for compound shown?

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

Select the word or phrase 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.)   …………………. are the different arrangement of atoms that are interconverted by rotation about a single bond. Complete word/phrase and correct spelling (verbatim) is required. No partial credit.

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?