13. Alkenes, Alkynes, and Aromatic Compounds

2-Aminopropane is an achiral molecule, but 2-aminobutane is chiral. Explain.

Define the following terms:

b. Achiral

Which of the following molecules are chiral? (Hint: Draw each molecule and analyze it as illustrated in Worked Example 14.2.)

a. 3-Chloropentane

b. 2-Chloropentane

c. <IMAGE>

Define the following terms:

c. Chiral carbon

Identify the chiral center(s) in each of the following molecules:

a. 2-Methyl-3-pentanol

Which of the alcohols pictured in Problem 14.48 are chiral? Indicate the chiral carbons for those that are chiral.

Are the following molecules chiral or achiral? If they are chiral, identify the chiral carbon atom(s).

d. <IMAGE>

Identify all chiral centers in the isomers that you drew for part (a).

Mark the chiral centers in the following molecules, if any, with an asterisk (*):

(a) <IMAGE> 

Mark the chiral centers in the following molecules, if any, with an asterisk (*):

(d) <IMAGE>                                                                                                                                                                     

   Ritalin®

ALLIED Health Mark the chiral centers in the following molecules, if any, with an asterisk (*):

(b) <IMAGE>                                                                                                                                                                   

 Pantothenic Acid, a B vitamin

ALLIED Health Mark the chiral centers in the following molecules, if any, with an asterisk (*).

(a) <IMAGE>

Threonine, an amino acid

ALLIED Health Mark the chiral centers in the following molecules, if any, with an asterisk (*).

(d) <IMAGE>

Tramadol, an analgesic

ALLIED Health Mark the chiral centers in the following molecules, if any, with an asterisk (*).

(d) <IMAGE>

Dihydroxyacetone, used in spray tanning

ALLIED Health Mark the chiral centers in the following molecules, if any, with an asterisk (*):

(d) <IMAGE>                                                                                                                                                                   

Dihydroxyacetone phosphate, an intermediate in the metabolism of carbohydrates