To really evaluate the success of this synthesis, you will need to carefully con

Question

To really evaluate the success of this synthesis, you will need to carefully consider the following; purity, percent yield, melting point behaviour. To say your experiment was a success and that you have made a reasonable amount of cholesteryl nonanoate, you want to make sure all of these were successful. Which of the following statements is true? Cholesteryl nonanoate has been successfully prepared if the percent yield is 20%, the melting point was 73-75 degree C and Liquid crystalline behaviour was observed when preparing a liquid crystal display. Cholesteryl nonanoate has been successfully prepared if the percent yield is 60%, the melting point was 72-80 degree C and Liquid crystalline behaviour was observed when preparing a liquid crystal display. Cholesteryl nonanoate has been successfully prepared if the percent yield is 80%, the melting point was 130 degree C and liquid crystalline behaviour was observed when preparing a liquid crystal display. Cholesteryl nonanoate has been successfully prepared if the percent yield is 90%, the melting point was 74-86 degree C and Liquid crystaline behaviour was not observed when preparing a liquid crystal display.

Explanation / Answer

The melting point of cholesteryl nonanoate is 77- 82C and it displays liquid crystal behaviour. Liquid crystals are the ones which melt over a range of temperature ( unlike compounds with a sharp melting point).

Thus the option (B) is correct , if it has 60% purity and melting range as 72 -80 C ( lowered due to the impurity) and shows liquid crystaline behavior when preparing a liquid crystal display.

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