3. Which of the compounds below will rotate the plane of plane-polarized light? 1 2 3 4 5 A) only 1 B) 3 and 5 C) 1, 3 and 5 D) only 3 E) 1 and 3 5 CO OH 8 9 4. What is the configuration of the two chiral centers in the molecule at the right? ייוון 1 3 A) 3R,7R B) 3R,7S C) 3S,7R D) 3S,7S 2 4 6
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- 5) How many chiral centers does this molecule have? .COOH он BrWhich of the following molecules would be chiral (has a mirror image) a) H b) CH3 c) OH d) OH Cl H - C – OH Cl – C – H Cl – C – Cl C = C H C2H5 H Br HX What is the absolute configuration 0/4 of the chiral centers in the following compound? H OH НО 3 OH HO' H 2R, 3R 2S, 3R 2R, 3S 2S, 3S 2.
- 9) Circle all the chiral centers in this molecule. Identify which centers are R and which ones are S. ОН СІ ОНThe structure shown below is 3-fluoro-2-butanol. What is the configuration of the chiral centers? A) 25, 3R он CH3 B) 2R, 3S CH3 C) 2R, 3R D) 25, 3Si) How many lone pairs of electrons are present? ii) What is the configuration of the chiral centre? iii) What is the hybridization of the nitrogen atom in the nitrile moiety? iv) How many pi bonds are there?
- CH3 CH3 CH3 CH3 CH3 H Br H Br H Br- H H. H. H 'H. H3C CH3 ČH3 Br 2-bromobutane a b The wedge-dash representation of 2-bromobutane is shown. What is the orientation of the chiral center(s)? Write the orientation as in the following examples, (2S) or (2R,3S), not 2s or 2R,3S. Be sure to include the parentheses and the number, and comma as necessary. Which of the Newman structures is equivalent to the wedge-dash structure? Note that the equivalent Newman structure will not necessarily have the same conformation as the wedge-dash structure.15) The molecule shown below is chiral? CH2OH HO2C HO2C Co,H H A) True B) False7) The following compound has how many chiral centers? CH3 CH3 A) 0 В) 1 C) 2 D) 3 E) 4