Which of the following is a mechanism for an S 2 reaction? Which of the followin

Question

Which of the following is a mechanism for an S 2 reaction? Which of the following is the rate low for the following reaction? A. Rate = k[H_2O] B. Rate = k[H_2O][1-chloro-methylcyclohexane] C. Rate = k[1-chloro-methylcyclohexane] D. Rate = k[chloride ion] Which of the following substrate sis the least reactive in an S 1 reaction. Which of the following is the product of the following reaction? Which of the following alkyl halides would likely undergo rearrangement during an S_ 1 reaction? For the following reaction, which of the following is the product? For the following reactions, which of the following is the product? What reaction mechanism is most likely for substitution on the following compound? A. S_N1 B. S_N2 C. Either D. Neither Which of the following compounds will react most rapidly with HCl? A) 5-methyl-1-hexene B) 4-methyl-1-hexene C) (E) -5-methyl-2-hexene D) (E) -2-methyl-3-hexene E) 2-methyl-2-hexene Which of the following alkenes yield(s) 3-bromo-3-methylpentane as the major product upon addition of HBr? A) I and II only B) III only C) I, II and III D) all of them E) none of them

Explanation / Answer

Quinidine molarity = 0.03385 g/324.14 g/mol x 0.05 L

                              = 0.0021 M

a) pH without addition of HCl

let quinidine be B,

B + H2O <==> BH+ + OH-

let x amount has been protonated

Kb1 = [BH+][OH-]/[B]

4 x 10^-6 = x^2/0.0021

x = [OH-] = 9.165 x 10^-5 M

pOH = -log[OH-] = 4.04

pH = 14 - pOH = 9.96

b) Volume of HCl needed to reach first stoichiometric point

= 0.0021 M x 50 ml/0.0150 M

= 7.0 ml

c) pOH at first stoichiometric point

= 1/2(pKb1 + pKb2)

= 1/2(5.398 + 10)

= 7.699

139.24 ml

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