Which explains why methoxyethene readily undergoes cationic polymerization? Choose one: O stabilizes the carbanion intermediate. O destabilizes the carbocation intermediate. O is electron-withdrawing overall. O is electron-donating overall.
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- Rank the rate of cationic polymerization for the following molecules. Briefly explain why H C = CH₂ CH3 C= CH₂ H = CH₂Which one of the following initiators can be used for free radical chain-growth polymerization? a) benzoyl peroxide b) BF3 c) CH3CH2CH2CH2Li d) Al(CH2CH3)3, TiCl4This polymer is composed of 2 monomer units: an acid chloride and an amine. In the box below, draw the structure of both monomers. (8-10 C (CH₂)6-C CH₂ 어 H n • 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. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate structures with + signs from the drop-down menu.
- Which of the following is the first step in the cationic polymerization of alkenes? Select one: Attack of π-electrons to a proton H+. Reduction of the π-electrons. Elongation of the polymer chain. Attack of π-electrons to a carbocation. Which of the following is FALSE regarding terminal alkynes? Select one: O The proton in the terminal carbon is weakly acidic. They react with H₂O, H₂SO4, HgSO4 to produce an aldehyde. O The hydrohalogenation reaction yields a geminal dihalide. O Treatment with alcoholic AgNO3 produces a silver acetylide.5. Ribose's structure is ОН HO ОН ОН a) Draw using the arrow formalism the reaction of linear ribose to make a 5-membered ring. b) What is the name of the resulting functional group? c) Given that reaction of alcohols (such as RCH2OH) with carbonyls (such as HCO-R') to create this functional group is typically not thermodynamically favored, why does most ribose in water exist as a 5-membered ring? A few word answer is fine. d) AG°for this reaction is about - 5 kJ/mol. Assuming that you start with a 1 mM solution of ribose in water, what is the approximate concentration at equilibrium of (i) the linear form? (ii) The cyclic form? (A good answer should be correct within 20%, e.g. it is fine to approximate 9 mM as 10 mM, but it is not okay to approximate 0.1 mM as 1 mM.) e) This reaction creates a new stereocenter. Please indicate it with a *. f) Consider the starting point for synthesis of purines like ATP, which is PRPP (pheseboribosylevOrhesehate) НО НО LOLOH HO ОН HO OH Pyrophosphate…Below are the reaction steps in a certain polymerization process, 22. which may occur by either an uncatalyzed or an acid-catalyzed pathway. 0–H R-C-o–H k1 + HA R-C+ A- k2 0–H Group 1 0–H 0–H k3 R-ċ+ A- + R'+o-H R—С—0—Н k4 0–H R-ó+ A- Group 2 H 0–H R–Ċ–0–H k5 R-C-0–R' + H-0 + НА A- Group 3 H Write a balanced chemical reaction for the overall process. RCOOH + HA + RCOOH2+ + A- + R'OH + RC(OH)2(R'OH)+ ® RCOOH2+ + RC(OH)2(R'OH)+ + RCOOR' + H2O + HA. RCOOH + R'OH 2 RCOOR' RCOOH + R'OH E RCOOR' + H20 RCOOH + HA 2 RCOOH2+ + A- RCOOH + R'OH + HA E RCOOR' + H2O + HA
- Predict the Product. Predict the major organic product(s) or reactant(s) for the following reactions. Please use proper polymer notation and show one (1) repeat unit for the products. НО OH Br be CI polymerize polymerize -[grola] polymerizeFor the substitution reaction. Draw the structure of the intermediate that forms in the rate determining step. Он HBr (aq) BrWhat type of chemical reaction is shown in the diagram below? RR R R Y-C-C-Z + Y-Z RR R elimination oxidation substitution reduction Why are free radicals during the initiation of addition polymerization very reactive? Because of a lone electron, and it wants to pair up with another electron Because free radicals want to break with the ester molecule monomer directly forming a new radical Because free radicals want to break with the ethylene molecule monomer directly forming a new radical Because of a lone pair of electrons, and it wants to pair up with another lone pair of electrons :C R