PART A$.$ A review of the basics $-$ chiral centers, enantiomers, absolute configuration, Fischer projections, polarimetry, and racemization.

What is the hybridization of a tetrahedral carbon?

What are the other types of hybridization of carbon and what are their molecular geometries?

Which of the following structures contain a chiral center? Place an asterisk at each chiral center.

The enantiomers of $3-$methylhexane are shown below. Which is the R enantiomer, and which is the S enantiomer?

For each Fischer projection, specify D or L$.$