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- Provide the E2 mechanism for β-elimination reactionemploying 2-chloro-2-methylbutane to prepare 2-methyl-2-butene and 2-methyl-1-butene reaction. Use the actual structures of thereactants and products. Explain which of the alkenes is the major product ofthis reaction ?You are required to synthesize 2-bromopentane from the reaction between an alkene with HBr. Which alkene, 1-pentene or 2-pentene, should you react with HBr in order to get 2-bromopentane? Give an explanation.An unknown hydrocarbon G, whose formula is C16H26 contains two triple bonds. Ozonolysis followed by reduction with (CH3)2S gave CH3(CH2)4CO2H and HO2CCH2CH2CO2H as the only products. Suggest a reasonable structure for compound G.
- Which of the statement is INCORRECT? a. The increase in stability of 2,4-hexadiene over 1,3-hexadiene is due to the increased double bond substitution of the former. b. The stabilization of dienes by conjugation is less pronounced than the aromatic stabilization of benzene. c. Resonance description in alkenes usually involves charge separation. d. Higher energy pi-orbitals often have decreasing number of nodes.The German chemist Wilhelm Kӧrner (1839-1925) observed in 1974 that each of the three isomers of dibromobenzene, A, B, and C, gave a different number of tribromobenzenes upon further bromination, allowing him to assign their respective structures. Try to do the same and assign structures to A, B, and C based on the following results: A gives two tribromobenzenes in comparable amounts B gives three tribromobenzenes, one of them in minor quantities C gives only one tribromobenzeneExplain briefly and clearly the following concepts, taking as reference the molecule of n-butane and the corresponding drawings or illustrations. See pages 149-152 of the book Organic Chemistry, sixth edition (J. G. Smith). 4. What is steric hindrance in a conformation? Then draw a picture to illustrate the concept? 5. What is the torsional stress of a conformation? Then draw a picture to illustrate the concept? 6. Describe 1,3-diaxial interaction and illustrate with a specific example.
- An unknown hydrocarbon A with the formula C6H12 reacts with 1 molar equivalent of H2 over a palladium catalyst. Hydrocarbon A also reacts with OsO4 to give diol B. When oxidized with KMnO4 in acidic solution, A gives two fragments. One fragment is propanoic acid, CH3CH2CO2H, and the other fragment is ketone C. What are the structures of A, B, and C? Write all reactions, and show your reasoning.* Explain the chemical foundation:a. The addition of water and alcohol to alkenes is only possible under. Acid catalysis.b. Electrophilic addition reactions are not stereospecific (except in the case of X2 addition).c. Regioselectivity in the X2 addition reactions, even though carbocations are not formed in this mechanism.Compound A has molecular formula C4H10, and gives two monochlorides, B and C, on photochemical chlorination. Treatment of either of these monochlorides with potassium tert-butoxide gives the same alkene (C4H8) as the product, but B leads to just one isomer of the alkene, D, where C gives D and another isomer of the alkene, E. Treatment of monochlorides B and C with aqueous ethanol gives products F and G, respectively, both of which are of molecular formula C4H10O. What are the names of compounds A-G?
- FUNCTIONAL GROUPS The research team on Natural Products Chemistry from De La Salle University-Dasmariñas under Mr. Gab has discovered a novel compound from an endemic Philippine nudibranch, Chromodoris cavitensis, whichinhabits the coral reef system near Caylabne Bay in Ternate, Cavite. Exhaustive analysis has revealed acomplex structure as shown below which they aptly named as “chromocavitenin”. Initial tests revealed that thiscompound has potent anti-carcinogenic properties. Encircle and identify the 13 distinct functional groups that arepresent in chromocavitenin.An unknown hydrocarbon A with the formula C6H12 reacts with 1 molar equivalent ofH2 over a palladium catalyst. Hydrocarbon A also reacts with OsO4 to give diol B. When oxidized with KMnO4 in acidic solution, A gives two fragments. One fragmentis propanoic acid, CH3CH2CO2H, and the other fragment is ketone C. What are thestructures of A, B, and C? Write all reactions and show your reasoning.A chemist allows some pure (2S,3R)-3-bromo-2,3-diphenylpentane to react with a solution of sodium ethoxide(NaOCH2CH3) in ethanol. The products are two alkenes: A (cis-trans mixture) and B, a single pure isomer. Under thesame conditions, the reaction of (2S,3S)-3-bromo-2,3-diphenylpentane gives two alkenes, A (cis-trans mixture) and C.Upon catalytic hydrogenation, all three of these alkenes (A, B, and C) give 2,3-diphenylpentane. Determine the structuresof A, B, and C; give equations for their formation; and explain the stereospecificity of these reactions