Ch. 1 - A Review of General ChemistryWorksheetSee all chapters
All Chapters
Ch. 1 - A Review of General Chemistry
Ch. 2 - Molecular Representations
Ch. 3 - Acids and Bases
Ch. 4 - Alkanes and Cycloalkanes
Ch. 5 - Chirality
Ch. 6 - Thermodynamics and Kinetics
Ch. 7 - Substitution Reactions
Ch. 8 - Elimination Reactions
Ch. 9 - Alkenes and Alkynes
Ch. 10 - Addition Reactions
Ch. 11 - Radical Reactions
Ch. 12 - Alcohols, Ethers, Epoxides and Thiols
Ch. 13 - Alcohols and Carbonyl Compounds
Ch. 14 - Synthetic Techniques
Ch. 15 - Analytical Techniques: IR, NMR, Mass Spect
Ch. 16 - Conjugated Systems
Ch. 17 - Aromaticity
Ch. 18 - Reactions of Aromatics: EAS and Beyond
Ch. 19 - Aldehydes and Ketones: Nucleophilic Addition
Ch. 20 - Carboxylic Acid Derivatives: NAS
Ch. 21 - Enolate Chemistry: Reactions at the Alpha-Carbon
Ch. 22 - Condensation Chemistry
Ch. 23 - Amines
Ch. 24 - Carbohydrates
Ch. 25 - Phenols
Ch. 26 - Amino Acids, Peptides, and Proteins

Solution: Write two additional resonance structures that are significant for the hydrocarbon anion shown below. Put in all lone pairs, multiple bonds and formal charges. Draw the curved arrows that show the delocalization of electrons. Label your two new structures as C’ & C”. Using the information on the charge distribution and your knowledge of what makes a stable contributor, indicate which (of C, C’, & C”) is/are the major-contributing and minor- contributing resonance structures that you have assigned.   Using these resonance structures, identify what the approximate charge on the oxygen atom and on the central carbon would be in the resonance hybrid. A localized charge is –1). Circle your answer below. For the oxygen atom: (a) –0.5 (b) between –0.5 and –0.33                  (c) –0.33                    (d) less than –0.33. For the center carbon: (a) –0.5 (b) between –0.5 and –0.33                   (c) –0.33                    (d) less than –0.33

Problem

Write two additional resonance structures that are significant for the hydrocarbon anion shown below. Put in all lone pairs, multiple bonds and formal charges. Draw the curved arrows that show the delocalization of electrons. Label your two new structures as C’ & C”. Using the information on the charge distribution and your knowledge of what makes a stable contributor, indicate which (of C, C’, & C”) is/are the major-contributing and minor- contributing resonance structures that you have assigned.

 

Using these resonance structures, identify what the approximate charge on the oxygen atom and on the central carbon would be in the resonance hybrid. A localized charge is –1). Circle your answer below.

For the oxygen atom:

(a) –0.5 (b) between –0.5 and –0.33                  (c) –0.33                    (d) less than –0.33.

For the center carbon:

(a) –0.5 (b) between –0.5 and –0.33                   (c) –0.33                    (d) less than –0.33