Answer to Question #136265 in Physical Chemistry for Nicole

Question

a) The pKa of p-chlorobenzoic acid is 3.98; that of benzoic acid is 4.19.

i)

Calculate σ for p-Cl.

b) If ρ value for the alkaline saponification of methyl esters of substituted benzoic acids is 2.38, and the rate constant for saponification of methyl benzoate under the conditions of interest is 2.0 x 10-4

L mol-1 s-1, Calculate the rate constant of methyl m-nitrobenzoate.

c) Match the ρ values with the appropriate reactions. Explain your reasoning.

Reaction constants: + 2.45, +0.75, -2.3`9, -7.29

Reactions are:

i)

Nitration of substituted benzenes

ii)

Ionization of substituted benzenthiols

iii)

Ionization of substituted benzenephosphonic acids

iv)

Reaction of substituted N,N-dimethylaniline with methyl iodide

Answer 1

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