On the structure below, draw in the p-orbitals to show how they are oriented and overlap. Draw the MO diagram for 1,3- butadiene and show which molecular orbitals the electrons occupy. Label the HOMO and LUM0
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Q: How many MOs does 1,3,5,7-octatetraene have?
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- d ОН HN, b e a) Besides "alkane" and "phenyl/benzene," name 3 functional groups present in carvedilol: FG1: FG2: FG3: b) What is the hybridization of this oxygen? c) What is the absolute configuration (R/S) of this center? d) The lone pair on this nitrogen resides in what orbital? e) Is this portion of carvedilol aromatic? Circle ONE: YES NO f) How many sp²-hybridized atoms are there in carvedilol?5. Draw the following molecules in two difference configurations about the double bond. Name the molecules and be sure to include the appropriate configuration (trans or cis). If the structure cannot be drawn in two different configurations. explain why a. H2C=CH2 b. CH3CH=CHCH3 с. CI(CH3)С-СHCH3Draw a resonance structure, complete with all formal charges and lone (unshared) electron pairs, that shows the resonance interaction of the chloro with the para position in chlorobenzene. 0 chlorobenzene • You do not have to consider stereochemistry. • Include all valence lone pairs in your answer. In cases where there is more than one answer, just draw one. . 99-85 On [F ChemDoodleⓇ
- The energy difference between a tert-butyl group going from equatorial to axial in a cyclohexane is 18.3 kJ/mol. When two of the carbon atoms are replaced with oxygen atoms (molecule B) the energy difference between the two chair conformations drops to 5.9 kJ/mol. Explain this difference. (Hint: Consider what makes putting groups axial unfavorable).7. Draw curved arrows indicating the movements of electrons between the following pair of resonance structures. Name the pattern of resonance shown. What is the hybridization of the carbon atoms? 8. Draw the remaining three resonance structures for the molecule in problem 7 above. 9. There are several possible forms of a trisubstituted cyclohexane with the formula C10H200. I have drawn four of them. From these, which one do you think is most commonly naturally occurring, and why? Which is least commonly occurring and why? HO HO" HO HOBelow is the structure for beta-carotene, a pigment found in plants and vegetables that give them their color. Determine how many alkenes are properly trans in the structure.
- 5. Construct models of all the stereoisomers of 1-bromopropene. Draw the line structure of your models. Are these molecules isomers? If they are isomers to what specific category do they belong? Assign E or Z descriptors to each compound, if appropriate. 6. Construct a model of dibromochloromethane and draw the perspective structure. How many planes of symmetry does this molecule possess? Construct the mirror image of your model. Are the two models superimposable? Classify or describe the relationship between these two mirror images, and assign R or S descriptors, if appropriate.Draw a resonance structure, complete with all formal charges and lone (unshared) electron pairs, that shows the resonance interaction of the cyano with the ortho position in benzonitrile. CEN benzonitrile • You do not have to consider stereochemistry. • Include all valence lone pairs in your answer. • In cases where there is more than one answer, just draw one.Explain the Electrostatic potential maps for different carbocations ?
- Classify the following structures as E/Z structuresFor each compound shown below, draw representations for the cis and trans isomers using a hexagon for the six-membered ring, and wedges and dashes for substituents. [1] [1] cis: [2] cis: or [3] cis: ere to search draw structure... draw structure ... draw structure ... ㅍ Bi [2] trans: trans: trans: draw structure... draw structure... draw structure... lyassign the stereochemical configuration of the selected tetrahedral carbon chiral centers (R, S or N (not a chiral center)) and the alkene (E, Z or N (not a stereocenter)) that are indicated by the arrows (note that you do not have to assign the configuration of every chiral center in the molecule). If the atom in question is not a chiral center or is not a stereocenter circle N for neither.