It should be explained that why compound A will not undergo a ring – opening reaction under thermal conditions, but compound B will. Concept introduction: Conjugated system: A system of connected p-orbitals with delocalized electrons with alternating single and multiple bonds and the compound may be cyclic, linear or mixed Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions. Woodward – Hoffmann rules for pericyclic reactions are listed below Number of conjugated Π bonds Reaction conditions Allowed mode of ring closure Even number Thermal Conrotatory Photochemical Disrotatory Odd number Thermal Disrotatory Photochemical Conrotatory Woodward – Hoffmann rules for the configuration of pericyclic reactions are, Substituents in the reactant Mode of ring closure Configuration of the product Point in opposite directions Disrotatory cis Conrotatory trans Point in the same directions Disrotatory trans Conrotatory cis

Question

An unknown weak acid with a concentration of 0.410 M has a pH of 5.600. What is the Ka of the weak acid?

Answer 1

Question

Chapter 28, Problem 41P

Interpretation Introduction

Interpretation:

It should be explained that why compound A will not undergo a ring – opening reaction under thermal conditions, but compound B will.

Concept introduction:

Conjugated system: A system of connected p-orbitals with delocalized electrons with alternating single and multiple bonds and the compound may be cyclic, linear or mixed

Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.

Woodward – Hoffmann rules for pericyclic reactions are listed below

Number of conjugated Π bondsReaction conditionsAllowed mode of ring closureEven numberThermalConrotatoryPhotochemicalDisrotatoryOdd numberThermalDisrotatoryPhotochemicalConrotatory

Woodward – Hoffmann rules for the configuration of pericyclic reactions are,

Substituents in the reactantMode of ring closure Configuration of the productPoint in opposite directionsDisrotatorycisConrotatorytransPoint in the same directionsDisrotatorytransConrotatorycis

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An unknown weak acid with a concentration of 0.410 M has a pH of 5.600. What is the Ka of the weak acid?

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