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

What is the appropriate IUPAC name for compound shown?

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? (higher ranking > lower ranking) ​ 1. −CH2OH 2. −CHO 3. −OCH3 4. −OCOCH3 ​

Bonus question Which are identical compounds?

Which of the following illustrates a correctly positioned equatorial OH?

What is the % ee of a sample of carvone that exhibits a specific rotation of −40, given that the specific rotation of (R)-carvone is −61?

Is the alkene on the left in the molecule below E, Z, or neither?

Which of the following Newman projections represents the most stable conformation of 2-methylbutane?

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

Select the word or phrase that complete each sentence (constitutional isomers, diastereomers, enantiomers, meso compounds, higher, lower, reaction, addition, carbocation, carbanion, nucleophile, electrophile, elimination, heterolysis, homolysis, reagent, substitution, stronger, weaker, charge, concerted, two step, SN1, SN2, racemization, hyperconjugation, alkyl halides, inversion):     When a racemic mixture is reacted with a single enantiomer of another compound, then a pair of _________ is formed. Complete word/phrase and correct spelling (verbatim) is required. No partial credit.