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- Define the consequence of resonance stabilization ?According to the conventions above, what is the sign ( + or ) of the P.E. change (H) for Rxn 3?4 – Use bond-dissociation enthalpies (pg 167 of text) to calculate the DHo for each of the following reactions. CH3CH2CH3 + H2 g CH3CH3 + CH4 CH3CH2Cl + HI g CH3CH2I + HCl
- ОН HO "ОН Н ОН OH O,. ОН NH2 This is the molecule commonly known as Doxorubicin. Doxorubicin is used in chemotherapy to inhibit uncontrolled cell growth, a hallmark of cancerous cells. Doxorubicin specifically inhibits an enzyme called topoisomerase which helps remove supercoils in DNA as DNA is replicated during cell growth and division (mitosis). the following key to label the different Indicate the functional groups a part of Doxorubicin usi parts of the molecule (note not all functional groups listed may be a part of Doxorubicin): Carboxylic Acid label with a C Ketone label with a K Alcohol label with an A Ketal label with a T Aldehyde label with an H Ester label with an R Acetal label with an L Amine label with an M Amide label with a D Phenol label with a P Aromatic label with a B Ether label with an EThe first resonance structure of acetamide, CH3 CONH2, is shown. H :0: ☐ || H-C-C-N-H H H Determine the correct second resonance structure of acetamide. H :0: -1 +1 H-C-C-N-H H H H :0: -1 ☐ ☐ H-C=C-N-H H H H :0: H-C-N-C-H HH ●● -1 H:0: H H-C-C=N—H H HDetermine whether the following pairs of structures are actually different compounds or simply resonance forms of the same compounds. 1-41 0 0 and and (b) (a) O +0-H O 0-H and and (d) +NH₂ 0 NH₂ CH,-!-H + (e) CH₂=C H and CH₂-CH (Đ) CH–C−NH, and CH3–C=NH, + (g) CH₂=CH-CH₂ and CH₂-CH=CH₂ (h) CH₂=C=0 and H=C=C—OH Ο Η 0 H 0 H +O-H (i)/H-C-C-H and H-C=C-H (j) H-C-H and H¬C-H g H H O- 유 0 « -l- + (k) H-C-NH₂ and H-C=NH₂ (1) CH₂-C-CH=CH₂ and CH₂-C=CH-CH₂
- The unsaturation number or degree of unsaturation (U) can be used to determine the number of rings and multiple bonds in a compound from its molecular formula. Given a structure, you can determine the number of hydrogens without having to count them explicitly. Consider three compounds and their degree of unsaturation. (a) A compound A has the molecular formula C7H13ClN2OC7H13ClN2O. How many rings and/or π bonds does it contain?The bond length of the indicated C-C single bond in hexa-1,3,5-triene is about 146 pm, which is considerably shorter than that in ethane, H3C-CH3. (a) How much shorter is it? Hint: See Figure 14-2, page 685. (b) Which occupied T MOS (obtained in Problem 14.32) help decrease this bond length? (c) If an electron were promoted from the HOMO to the LUMO, would the length of the C-C single bond increase, decrease, or stay roughly the same? Explain. 146 pmRank the following set of compounds in order of increasing bond λmax.
- Complete energy diagram for the two-step conversion of A–B + C:−→ A:− + B–CDetermine the weakest C-H bond in each of the following compounds. (a) (b) (c) ОН16. Choose the correct New- man projection that cor- responds to point A on the graph of chemical potential energy vs. tation about the C2-C3 ro- bond of butane. A) H H CH3 H CH3 B) H 个 Potential Energy H H CH3 d CH3 H H 0 A 60 C) HH 120 180 240 300 Degrees rotation →→→→ H CH3 CH3 H 360 H3C CH3 пон D) H A H H