To say your experiment was a success and that you have made a resonable amount o

Question

To say your experiment was a success and that you have made a resonable amount of cholesteryl nonaoate, you want to make sure all of these were successful. Which of the following statements are true? There are three correct choices.
cholesteryl nonanoate has been successfully prepared if the percent yield is 90% the melting point was 74-77 C and liquid crystaline behaviour was not observed when preparing a liquid crystal display cholesteryl nonanoate has been successfully prepared if the percent yield is 80%, the melting point was 150°C and iqu crystaline behaviour was observed when preparing a liquid crystal display cholesteryl nonanoate has been successfully prepared if the percent yield is 20%, the melting point was 73-75°C and liquid crystaline 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 72-76°C and liquid crystaline behaviour was observed when preparing a liquid crystal display.

Explanation / Answer

Solution :-

Melting point of the cholesteryl nonaoate is in the range of 77 to 82 C

90 % yeild is the indication of the successful conversion of the reactants into the products

and no liquid crystalline behavior observed means its not the cholesteryl nonaoate

so the first statement is rulled out

in the second statement the melting point is too high so it is also rulled out

in the third statement the melting point is comparable but the percent yield is very low so it is also rulled out

in the fourth statement percent yield is 60 % which is quite good also melting paoint is comparable and it is showing liquid crystaline behavior means it is the correct statement

So the answer is the statement 4

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