Which of the following structures does not have a plane of symmetry?

Which of the following is (are) a meso compound(s)? I. 2,4-dichloropentane II. 1,3-dimethylcyclopentane III. 2,3-dichloropentane

Which of the following have the S configuration?

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.)   There are ________ London force interactions in the branched alkane. Complete word/phrase and correct spelling (verbatim) is required. No partial credit.

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

What is the relationship between the two structures shown?

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

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.)   Axial and equatorial hydrogen atoms are interconverted during a ……………………… Complete word/phrase and correct spelling (verbatim) is required. No partial credit.

Select the word or phrase that complete each sentence (constitutional isomers, diastereomers, enantiomers, meso compounds, higher, lower, reaction, addition, carbocation, carbanion, nucleophiles, electrophiles, elimination, heterolysis, homolysis, reagent, substitution, stronger, weaker, charge, concerted, two step, SN1, SN2, racemization, hyperconjugation, alkyl halides, inversion):  ( correct spelling are required. No partial credit).   Stereoisomers that are not mirror images of each are  ………………………………………….            Complete word/phrase and correct spelling (verbatim) is required. No partial credit.

Match the Newman projection for the conformation of 2-methylbutane to the indicated position on the potential energy diagram.                                       ​ A B C D Conformation D is represented by Roman numeral ____. (enter the Roman number. No other numbers will be accepted)