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- E 21 write mechanisms for the given reactionsGiven the dissociation constants for each deprotonation, what is the dissociation constant for the overall reaction (Ka’’)? H3PO4 + H2O H2PO4- + H3O+ Ka = 7.11 x 10-3 H2PO4- + H2O HPO42- + H3O+ Ka’ = 6.32 x 10-8 Overall: H3PO4 + 2 H2O HPO42- + 2 H3O+ Ka’’ = ? 1.13 x 105 4.49 x 10-10 8.89 x 10-6 2.23 x 109An SN1 reaction is shown in the box; the reaction energy profile diagram for this reaction is shown below. Identify the location for Compound I on the reaction profile. A) 1 B) 2 C) 3 D) 4 E) 5
- What happens when (write reactions involved) iv and vGiven the dissociation constants for each deprotonation, what is the dissociation constant for the overall reaction (Ka’’)? H3PO4 + H2O H2PO4- + H3O+ Ka = 7.11 x 10-3 H2PO4- + H2O HPO42- + H3O+ Ka’ = 6.32 x 10-8 Overall: H3PO4 + 2 H2O HPO42- + 2 H3O+ Ka’’ = ?The rate law for the reaction of HO- with tert-butyl bromide to form an elimination product in 75% ethanol/25% water at 30 °C is the sum of the rate laws for the E2 and E1 reactions. What percentage of the reaction takes place by an E2 pathway when [HO-] = 5.0 M? (k2 = 7.1 * 10 - 5, and k1 = 1.5 * 10 - 5) rate = rate law for the E2 reaction + rate law for the E1 reation rate = k2 3tert@butyl bromide43HO-4 + k1 3tert@butyl bromide4
- 12.The products of the reaction KMnO4 + ZnCO3 KMnO4 + ZnCO3 A) KCO3 + ZnMnO4 B) KCO3 + Zn(MnO4)2 C) K2CO3 + Zn( MnO4)2 D) K2CO3 + ZnMnO4. Highlight all the safety features mentioned. Is this reaction more dangerous than most reactions? 4,4'-DIBROMOBIPHENYL Robert E. Buckles and Norris G. Wheeler1. 1. Procedure In a 15-cm. evaporating dish is placed 15.4 g. (0.10 mole) of finely powdered biphenyl (Note 1). The dish is set on a porcelain rack in a 30-cm. desiccator with a 10-cm. evaporating dish under the rack containing 39 g. (12 ml., 0.24 mole) of bromine. The desiccator is closed, but a very small opening is provided for the escape of hydrogen bromide (Note 2). The biphenyl is left in contact with the bromine vapor for 8 hours (or overnight). The orange solid is then removed from the desiccator and allowed to stand in the air under a hood for at least 4 hours (Note 3). At this point, the product weighs about 30 g. and has a melting point in the neighborhood of 152°. The crude 4,4'-dibromobiphenyl is dissolved in 75 ml. of benzene, filtered, and cooled to 15°. The resulting crystals are filtered, giving a…A wittig reaction experiment: Week 1 -》 preparation of phosphonium salt Materials : triphenylphosphine (5.3g),methyl Bromoacetate 3.36g (2.1ml) , ethanol 30ml . The yield obtained was 8.93g . Calculate the percentage yield Week 2 -》 Formation of the tlide and wittig reaction Materials :Phosphonium salt (5g), napthyl-2- carboxwaldehyde( 2.65g), 20 ml of water and 5 nl of Nahco3. Yield obtained was 0.51g .Calculate the percentage yield Week 3: Solvent free wittig reaction Materials: Benzyltriphenylphosphonium chloride (0.5g ), 4 - Bromoabenzaldehyde (0.24g), Potassium phosphate (tribasi c) 0.275g .The yield obtained was 1.21g. Calculate the percentage yield
- How the rate of reaction is affected by phenomenon of selectivity? 3 examples.what products are produced in the reaction II, III, IV I and IV I, II, III, and IV I, II, III II and IIIChoose the best reagents from the list provided below for carrying out the following conversion. Match the reagent with the step number. HCl (aq), Zn(Hg) KMnO4, H3O+ CH3Cl, AlCl3 HNO3, H2SO4 Cl2, FeCl3 fuming sulfuric acid