Concept explainers
(a)
Interpretation:
The pKa value for a protonated
Concept introduction:
The stability of a charged species depends on the groups attached to the positively charged atom. The electron withdrawing group increases the concentration of positive charge on the nearby atom. While, the electron donating group decreases the concentration of positive charge on the nearby atom. This increases the stability of nearby positively charged atom. In general, cations are stabilized by electron-donating groups near the positive charge.
(b)
Interpretation:
The pKa value for a protonated amine (R3NH+) depends on the number of alkyl groups attached to N, as shown below. This order disagrees with what we would predict using charge stability. The reason for the discrepancy is to be explained.
Concept introduction:
The stability of a charged species decreases as the effective electronegativity of an atom bearing a positive charge increases. The electron donating group decreases the concentration of positive charge on the nearby atom. This increases the stability of nearby positively charged atom. In general, cations are stabilized by electron-donating groups near the positive charge. Bulky group around the cation, reduces the solvation process. This decreases the stability of the ion and increases acidity.
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Chapter 6 Solutions
EBK GET READY FOR ORGANIC CHEMISTRY
- Transmitance 3. Which one of the following compounds corresponds to this IR spectrum? Point out the absorption band(s) that helped you decide. OH H3C OH H₂C CH3 H3C CH3 H3C INFRARED SPECTRUM 0.8- 0.6 0.4- 0.2 3000 2000 1000 Wavenumber (cm-1) 4. Consider this compound: H3C On the structure above, label the different types of H's as A, B, C, etc. In table form, list the labeled signals, and for each one state the number of hydrogens, their shifts, and the splitting you would observe for these hydrogens in the ¹H NMR spectrum. Label # of hydrogens splitting Shift (2)arrow_forwardNonearrow_forwardDraw the Lewis structure of C2H4Oarrow_forward
- a) 5. Circle all acidic (and anticoplanar to the Leaving group) protons in the following molecules, Solve these elimination reactions, and identify the major and minor products where appropriate: 20 points + NaOCH3 Br (2 productarrow_forwardNonearrow_forwardDr. Mendel asked his BIOL 260 class what their height was and what their parent's heights were. He plotted that data in the graph below to determine if height was a heritable trait. A. Is height a heritable trait? If yes, what is the heritability value? (2 pts) B. If the phenotypic variation is 30, what is the variation due to additive alleles? (2 pts) Offspring Height (Inches) 75 67.5 60 52.5 y = 0.9264x + 4.8519 55 60 65 MidParent Height (Inches) 70 75 12pt v V Paragraph B IUA > AT2 v Varrow_forward
- Organic Chemistry: A Guided InquiryChemistryISBN:9780618974122Author:Andrei StraumanisPublisher:Cengage LearningOrganic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning
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