SOLVED

31) Which of the following structures represents a structure of R isomer of 1-amino-2-propanol? A) B) C) D) E) 32) Which statements regarding chiral compounds are correct? I) “Chiral carbon” is synonymous with “asymmetric carbon”. II) The presence of one chiral carbon in a structure results in two possible enantiomers. III) Two enantiomers can be interconverted without breaking any bonds. IV) Two chiral molecules are mirror images of each other. V) Two chiral molecules have significantly different chemical properties. A) II), III), and V) B) I), II), and IV) C) I), III), and IV) D) II), IV) and V) E) III), and V) 33) There are three rules for assigning priorities: Rule 1: A substituent atom of higher atomic number takes precedence over one of lower atomic number Rule 2: If two substituent atoms attached to the stereocenter have the same priority, the atom on the right of a hydrogen atom bonded to chiral carbon is a substituent of higher priority. Rule 3: Double and triple bonds are treated as if they were single, and the atoms in them are duplicated or triplicated at each end by the particular atoms at the other end of the multiple bond. Which rule(s) is/are stated incorrectly? A) rule 2 B) rules 1 and 3 C) rule 3 D) rules 2 and 3 E) rules 1 and 2 34) How many chiral carbon atoms can you find in the molecule below? A) 0 B) 1 C) 2 D) 3 E) 4 35) How many chiral carbon atoms can you find in the molecule below? A) 1 B) 2 C) 3 D) 4 E) 5 36) You found an organic compound containing chiral carbon atom with the following four substituents: HC≡C-, Cl-, O=C- and H2C=CH-. What would be the correct order of their priorities? A) HC≡C- > O=C- > Cl- > H2C=CH- B) Cl- > HC≡C- > O=C- > H2C=CH- C) Cl- > O=C- > HC≡C- > H2C=CH- D) Cl- > O=C-> H2C=CH- > HC≡C- E) O=C- > Cl- > HC≡C- > H2C=CH- 37) Give the name for CH3CH?CHCH3. A) 3-butene B) 2-butene C) 2-propene D) 2-pentene E) 2-butane 38) Find the correct stereochemistries for the following four alkenes: A) A is Z, B is Z, C is E, D is E B) A is Z, B is E, C is Z, D is E C) A is E, B is E, C is Z, D is E D) A is E, B is E, C is Z, D is Z E) A is Z, B is Z, C is E, D is Z 39) Choose the best configuration assignments for the three double bonds, labeled A, B and C, in the following compound: A) A is trans, B is trans, and C is Z B) A is cis, B is cis, and C is Z C) A is trans, B is trans, and C is E D) A is trans, B is trans, and C is cis E) A is trans, B is trans, and C is trans 40) Why does benzene have a much higher boiling point (80°C) than hexane (69°C), even though they have the same number of carbons? A) Benzene has fewer hydrogens than hexane. B) Benzene is much more polar than hexane which enhances the attractive forces between molecules and raises the boiling point. C) Benzene is planar and has delocalized electron density which increases the attractive forces between molecules and raises the boiling point. D) Hexane has more Kekulé structures than benzene. E) Benzene can covalently bond to another benzene molecule which increases its boiling point.