1. Show the calculation of theoretical and percentage yield, paying attention to
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Question
1. Show the calculation of theoretical and percentage yield, paying attention to units and significant figures. Discuss the yield you obtained and how it could be improved 2. From the provided chromatogram report the ratio of 1-alkene to 2-alkene. The area rule? of GC peaks is calculated by triangulation. Do these results confirm Zaitsev's 3 Compare the boiling range of your product to the literature value. Properly reference any sources of information used. A.. Il 3€1 ilnic; esorbies! Illinerii hn l :1 garan liries@:lniearn? 5. Report your results for the test you performed using bromine in dichloromethane. Compare the behaviour of your product with that of the starting alcohol toward Br2. 6. Why is it necessary to distil the alkene product away from the reaction mixture as it is formed, rather than letting it stay in the flask as the reaction proceeds?Explanation / Answer
1. The theoretical yield (%) = (theoretical no. of mmol of product / no. of mmol of starting substrate) * 100
The practical yield of the product (%) = (obtained/observed no. of mmol of product / no. of mmol of starting substrate) * 100
2. Integrate both the peaks for 1-alkene and 2-alkene and find the area of each peak.
Now, the ratio of 1-alkene to 2-alkene can be calculated as shown below.
= Area of 1-alkene / Area of 2-alkene
For sure, the ratio will be much less than 1 because of the formation of small amount of 1-alkene.
3. Obviously, the boiling range of the major obtained product will match with the stable product, i.e. 2-alkene.
4. This experiment should have the E2 mechanism as the obtained product is more substituted one, i.e. 2-alkene.
5. The product (2-alkene) on bromination with Br2/CH2Cl2 gives trans-2,3-dibromoalkane, whereas the same reaction using the starting alcohol gives 2-bromoalkane.
6. The reason is to separate the mixture of 1- and 2- alkenes and to get pure 2-alkene.
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