6 lab related questions (lab3)

Questions:

20. The chiral carboxylic acid A (CSH60Z) reacts with 1 mol of hydrogen gas
on catalytic hydrogenation. The product is an achiral carboxylic acid B
(CSHSO2). What are the structures of Compounds A and B?



21. What chemical test would you use to distinguish between the 1-octene
starting material and the octane product?


22. Give the structure and names of five alkenes having the molecular formula
C6H12 that produce hexane on catalytic hydrogenation.


23. In an unsymmetrical alkene, the boron atom adds predominantly to the
least substituted carbon atom. For example, 2-methyl-2-butene gives the
products indicated in your lab textbook on pg. 259 (#6-90). Explain the
ratio obtained.


24. The decomposition of 3-sulfolene to form 1,3-butadiene generates 1 mole
of sulfur dioxide gas per mole of 1,3-butadiene. Substantial quantities of
S02 would be generated if this decomposition were carried out on a large
scale. Suggest a method for trapping the gas to prevent its escape into the
environment.


25. Two structural isomers are formed when 2-methyl-1,3-butadiene reacts
with ethyl acrylate (ethyl 2-propenoate). Draw structures for these
Isomers.