The effect on the boiling point of a solution by the addition of soluble nonvolatile and insoluble substance should be determined. Also, the temperature of the vapor above these solutions should be determined. Concept introduction: Temperature value at which vapor pressure of the liquid and atmospheric pressure becomes the same is termed as the boiling point of that given liquid. At this temperature, change from liquid to vapor phase occurs. Soluble substances dissolve in the water, and insoluble substances do not go into the water.

Question

Synthesis of Ibuprofen-Part 1: 1. What characteristic absorption band changes would you expect in the IR spectrum on going from p-isobutylacetophenone to 1-(4-isobutylphenyl)-ethanol and then to 1-(4-isobutylphenyl)-1-choroethane as you did in the experiment today? Give approximate wavenumbers associated with each functional group change. Given that the mechanism of the chlorination reaction today involves formation of a benzylic carbocation, explain why the following rearranged product is not formed. محرم محمد 3. Why do we use dilute HCl for the first step of the reaction today and concentrated HCI for the second step? What signals appeared/disappeared/shifted that indicate that you have your intended product and not starting material? What other impurities are present in your product and how do you know?

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Chapter 5, Problem 5Q

Interpretation Introduction

Interpretation:

The effect on the boiling point of a solution by the addition of soluble nonvolatile and insoluble substance should be determined. Also, the temperature of the vapor above these solutions should be determined.

Concept introduction:

Temperature value at which vapor pressure of the liquid and atmospheric pressure becomes the same is termed as the boiling point of that given liquid. At this temperature, change from liquid to vapor phase occurs.

Soluble substances dissolve in the water, and insoluble substances do not go into the water.

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Synthesis of Ibuprofen-Part 1: 1. What characteristic absorption band changes would you expect in the IR spectrum on going from p-isobutylacetophenone to 1-(4-isobutylphenyl)-ethanol and then to 1-(4-isobutylphenyl)-1-choroethane as you did in the experiment today? Give approximate wavenumbers associated with each functional group change. Given that the mechanism of the chlorination reaction today involves formation of a benzylic carbocation, explain why the following rearranged product is not formed. محرم محمد 3. Why do we use dilute HCl for the first step of the reaction today and concentrated HCI for the second step? What signals appeared/disappeared/shifted that indicate that you have your intended product and not starting material? What other impurities are present in your product and how do you know?

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