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17 How many stereoisomers are possible for each of the following structure? Draw them, and name each by R-S and E-Z conventions a. 3-methyl-1,4-pentadiene c. 2-bromo-5-chloro-3-hexene b. 3-methyl-1,4-hexadiene d. 2,5-dichloro-3-hexene 18 What is the deference between a) enantiomers and diastereomers? b) meso compounds and achiral compounds 19 Identify and draw the most stable conformation of a) ethane b) Butane c) Cyclohexane 5 20 Below are Newman projection for the three tartaric acids (R,R), (S,S), and meso. Which is which? 21 Name the following cis-trans pair. a) d) 22 Explain with the aid of conformational structure why cis-1,3-dimethylcyclohexane is more stable than trans-1,3-dimethylcyclohexane, whereas the reverse order of stability is observed for the 1,2 and 1,4 isomers. 23 Does ascorbic acid (vitamin C) has a D or L configuration? ascorbic acid 24 Convert the structure of the following compounds in to Fischer and Newmann projection. b

          17 How many stereoisomers are possible for each of the following structure? Draw them, and name each by R-S and E-Z conventions
a. 3-methyl-1,4-pentadiene
c. 2-bromo-5-chloro-3-hexene
b. 3-methyl-1,4-hexadiene
d. 2,5-dichloro-3-hexene
18 What is the deference between a) enantiomers and diastereomers?
b) meso compounds and achiral compounds
19 Identify and draw the most stable conformation of a) ethane
b) Butane
c) Cyclohexane
5
20 Below are Newman projection for the three tartaric acids (R,R), (S,S), and meso. Which is which?
21 Name the following cis-trans pair.
a)
d)
22 Explain with the aid of conformational structure why cis-1,3-dimethylcyclohexane is more stable than trans-1,3-dimethylcyclohexane, whereas the reverse order of stability is observed for the 1,2 and 1,4 isomers.
23 Does ascorbic acid (vitamin C) has a D or L configuration? ascorbic acid
24 Convert the structure of the following compounds in to Fischer and Newmann projection.
b

17 How many stereoisomers are possible for each of the following structure? Draw them, and name each by R-S and E-Z conventions
a. 3-methyl-1,4-pentadiene
c. 2-bromo-5-chloro-3-hexene
b. 3-methyl-1,4-hexadiene
d. 2,5-dichloro-3-hexene
18 What is the deference between a) enantiomers and diastereomers?
b) meso compounds and achiral compounds
19 Identify and draw the most stable conformation of a) ethane
b) Butane
c) Cyclohexane
5
20 Below are Newman projection for the three tartaric acids (R,R), (S,S), and meso. Which is which?
21 Name the following cis-trans pair.
a)
d)
22 Explain with the aid of conformational structure why cis-1,3-dimethylcyclohexane is more stable than trans-1,3-dimethylcyclohexane, whereas the reverse order of stability is observed for the 1,2 and 1,4 isomers.
23 Does ascorbic acid (vitamin C) has a D or L configuration? ascorbic acid
24 Convert the structure of the following compounds in to Fischer and Newmann projection.
b

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