4. A student has prepared 0.05 M solution of CH3-C=CH and has added to it 0.05 M solution of potassium tert-butoxide (K* O-C(CH3)3). (iv) Calculate the percentage of deprotonated methyl acetylene taking into account that pKa of the conjugate acid of potassium tert-butoxide equals 18 and pKa of methyl acetylene equals 24.
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- (a) Tsomane and Nyiko were given a task of synthesising methylenecyclohexane 2. After a brief discussion with each other, Tsomane proposed Method A to synthesise 2 from cyclohexanone 1 while Nyiko proposed Method B that started from hydroxymethylcyclohexane 3. Each student believed that their proposed method is better than the other. (Scheme below) Ph THF A Ph Ph B H₂SO4 100 °C 3 OH (iii) In analysing both these methods, are there other possible alkene products other than methylenecyclohexane 2? Use mechanistic details to support your answer.(a) Tsomane and Nyiko were given a task of synthesising methylenecyclohexane 2. After a brief discussion with each other, Tsomane proposed Method A to synthesise 2 from cyclohexanone 1 while Nyiko proposed Method B that started from hydroxymethylcyclohexane 3. Each student believed that their proposed method is better than the other. (Scheme below) (1) 1 Ph THF A Ph Ph B H₂SO4 100 °C 3 OH What is the name of the reaction that is followed by reaction Method A?Predict the principal organic product of each of the following reactions: (a) (b) (c) 8 Br + NaC CH + CH3CH₂Li 1. Mg, THF | 2. HCH 3. H30+ 1. liquid ammonia 2. H3O+ 1. diethyl ether 2. H3O+
- (b) Predict the suitable solvent (H2O or CH3COCH3) to increase the reaction of bromopropane (CH3CH2CH2B1) with sodium hydroxide (NaOH). Two reactions are shown below: NaOH, 55 °C CH;CH,CH,Br CH;CH,CH,OH + NaBr H,O (i) NaOH, 55 °C CH;CH,CH,Br CH;CH,CH,OH NaBr H,C CH (ii)Conjugate base acid Cyclopentadiene pKa 1) Consider the reaction AH(+) + H₂O →> A:+H3O+. For the following named acids: 1) draw the structure of the acid, 2) give the approximate pKa of the conjugate acid (±1 pKa unit), 3) give the name of the conjugate base, and 4) draw the structure of the conjugate base. For the purposes of answering this question you may use pKa values evenly divisible by 5. p-Methoxyanilinium cation pKa Benzenesulfonic acid Butanal pKa pKa3. Provide the products, intermediates, and/or reagents for the following reactions: (a) CH3 (i) H2N CH3 pyridine Ph (b) он PBr3 PPh, кови (ii) (iii) (iv) then (c) Ph Br. (v) CH3 (d) HNO, (excess) (vi) CH3 H2SO4 (e) 2 Li(s) Ph-CEN (vii) (viii) then HCI, H20 HO (x) (1) DIBAL-H HO t-Bu, (ix) then NaOH, H20 p-TSOH (g) NH2 CH3 (xi) Но pyridine Но
- 9. (a) Under certain conditions, the reaction of 0.5 M 1-bromobutane with 1.0 M sodium methoxide forms 1-methoxybutane at a rate of 0.05 mol/L per second. What would be the rate if 0.1 M 1-bromobutane and 2.0 M NaOCH3 were used? (b) Consider the reaction of 1-bromobutane with a large excess of ammonia (NH3). Draw the reactants, the transition state, and the products. Note that the initial product is the salt of an amine (RNH* Br) which is deprotonated by the excess ammonia to give the amine. (c) Show another SN2 reaction using a different combination of an alkoxide and an alkyl bromide that also produces 1-methoxybutane.Identify (A) in the following reaction. 2H2 Pt (A) KMNO4 Warm conc. || С — С — о—н |CO,H + HO CO2H cis-cyclo hexane 1,2-dicarboxylic acid (a) (b) (c) (d)3-If the p-value of alkaline saponification of methylbenzoate is 2.38 and the rate constant for saponification of methylbenzoate under these conditions is 2x104 calculate the rate constant for hydrolysis of methyl-m-nitrobenzoate.
- Using hard-soft concepts, which of the following reactions are predicted to have an equilibrium constant greater than 1? Unless otherwise stated, assume gas-phase or hydrocarbon solution and 25 °C: Please explain step by step. (a) R3P-BBr3 + R3N-BF3 ↔ R3P-BF3 + R3N-BBr3 (b) SO2 + Ph3P-HOCMe3 ↔ Ph3P-SO2 + HOCMe3 Please type answer note write by hend.6) If you are given a mixture consisting of following 3 compounds, explain how you would separate the components by solvent extraction method NH2 ÇOOH (A) Cyclopentylamine (B) 2,4-Cyclopentadiene-1-carboxylic acid (C) BenzeneA student attempted to prepare 1-chlorobutane by mixing 1-butanol with NaCl in acetone. Was the student succesful? Explain.