Draw the most stable resonance form for the intermediate in the following electrophilic substitution reaction. You do not have to consider stereochemistry. Include all valence lone pairs in your answer.

Please circle the correct resonane structures

Don't use hand raiting please

a) Free radical bromination is more selective than free radical chlorination. Draw a reaction coordinate diagram for the specific step in the radical chain mechanism that illustrates the source of this selectivity, and explain your reasoning. b) Explain why the bond dissociate energy (BDE) of tert-butane is 95 kcal/mol while the BDE for propane is 99 kcal/mol.

How much free energy is released under standard conditions when electrons are passed from succinate to ubiquinone?  Note: The Faraday constant F = 23.1 kcal/(mole x volt) A) About 0.069 kcal/mol B) About 54 kcal/mol C) About 35 kcal/mol D) About 1.6 kcal/mol E) None of the above, energy is required for electrons to flow from       succinate to ubiquinone

Draw the structure(s) of the major organic product(s) of the following reaction. You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer. They will not be considered in the grading. • If no reaction occurs, draw the organic starting material. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate multiple products using the + sign from the drop-down menu. + Ag₂O/ aqueous THF, 0⁰ TIX. ? ChemDoodleⓇ ▾ < ба

Draw the structure(s) of the major organic product(s) of the following reaction. PPhs THF • Use the wedge/hash bond tools to indicate stereochemistry where it exists. • If the reaction produces a racemic mixture, draw both stereoisomers. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. Include anionic counter-ions, e.g., I, in your answer, but draw them in their own sketcher.

draw the tetrahedral intermediate as it is ormed in the following reaction. H₂C O NH₂ HCI/H₂O reflux You do not have to consider stereochemistry. Include all valence lone pairs in your answer. Do not include counter-ions, e.g., Na+, I, in your answe In cases where there is more than one answer, just draw

Draw the structure(s) of the major organic product(s) of the following reaction. H H You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer. They will not be considered in the grading. • If no reaction occurs, draw the organic starting material. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate multiple products using the + sign from the drop-down menu. 1. LIAIH4 / dry Et₂0 2. aqueous HCI 2 OOD OO. [F ChemDoodleⓇ < 26

Consider the structures of the carbocations formed by ortho attack of the electrophile, "NO, on the given starting material. Draw all resonance structures for the carbocation formed by ortho attack of the electrophile NO on the given starting material. If applicable, include the resonance structure in which π bond electrons "move" to the more electronegative atom as a lone pair. Be sure to include all charges and relevant lone pairs. Which resonance structure is the most unstable? Part 1 of 2 :0: NO2 A B :0: :Ö: а NO₂ C NO₂ + Draw all resonance structures for the carbocation formed by ortho attack of the electrophile "NO, on the given starting material. If applicable, include the resonance structure in which I bond electrons "move" to the more electronegative atom as a lone pair. Be sure to include all charges and relevant lone pairs.