1 - warm the mixture briefly with a warm-water bath and...

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1. The o: p ratio in the mononitration of bromobenzene has been reported to be 38:62. Using this ratio and the amount of 4-nitrobromobenzene you obtained, calculate the experimental yield of your reaction? 2. Why is the bromobenzene added in portions over a 15-min period rather than all at once ? We add the bromobenzene solution in portions to the reaction flask at just such a rate so as to maintain a gentle reflux. If the exothermic formation occurs too fast, the product yield may also be reduced. Should the reaction have become too vigorous we would cool the flask a bit with the ice-water bath, and reduce the rate of addition from the separatory funnel. If the spontaneous boiling of the mixture were to become too slow, we would increase the rate of addition slightly and/or
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Unformatted text preview: warm the mixture briefly with a warm-water bath and swirl the flask to mix the reagents. 3. Explain why 4-nitrobromobenzene predominates in the product mixture. 4. Why is dinitration not a significant process under the conditions used ? 5. What is the function of the concentrated sulfuric acid in this experiment ? 6. Why is the reaction flask shaken frequently during the addition of the bromobenzene to the acid mixture? 7. Is the nitration reaction exothermic or endothermic ? 8. What compounds are present in the aqueous solution from which the bromobenzene isomers are filtered? 9. Why is the p-isomer of the product less soluble in ethanol than the o-isomer ? 10. Explain the theory of TLC....
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This note was uploaded on 07/14/2011 for the course BIO 202 taught by Professor Dr.grace during the Spring '11 term at CSU Long Beach.

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1 - warm the mixture briefly with a warm-water bath and...

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