8303212-62-Indentifying-Organic - Chem Factsheet...

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Answering Questions on Identifying Unknown Organic Compounds Number 62 1 C hem F actsheet www.curriculumpress.co.uk Before reading through this Factsheet you should: Have some practical experience of organic chemistry tests and preparations (Factsheet 60); Have a good understanding of different spectroscopic techniques (Factsheets 54, 55 and 56); Have a good understanding of AS/A2 organic chemistry; Have a good understanding and knowledge of organic functional groups and their reactions. After working through this Factsheet you will be able to: Identify unknown organic chemicals when supplied with the necessary information in a written exam or practical situation. The aim of this Factsheet is to build on knowledge of organic chemical testing and spectroscopic techniques to enable candidates to attempt a specific type of question. Candidates are often asked to identify an organic compound having been given some information about that compound. Sometimes all of the relevant information is supplied, and sometimes in practical situations candidates are given instructions so as the necessary information can be discovered by chemical testing. Information supplied in the question Exam Hint : Read the question carefully, assume any information about the unknown chemical supplied is important and must be considered. "Tick off" the information to make sure you have used all of it. Such problems on identifying unknown organic problems generally begin by supplying the first ‘clues’. Often this will be information about the composition: E.g. Compound X contains carbon, hydrogen and oxygen only. Sometimes the molecular mass or even the molecular formula is supplied. Results of Chemical Tests In a practical exam or assessment, candidates may be given instructions to carry out simple organic tests, or in a written exam results of such tests may be described. Inferences must be drawn from these about the unknown compound. The following table is not a definitive list of chemical tests (see Factsheet 60 for more information) but is included to help candidates make links between test observations and inferences about unknown organic compounds. Reagents Dry PCl 5 solid Sodium carbonate or sodium hydrogen carbonate 2,4-dinitrophenylhydrazine Ammoniacal silver nitrate Fehling's solution Iodine and sodium hydroxide (or potassium iodide and sodium chlorate (I)) Acidified potassium dichromate (VI) Bromine water Sodium hydroxide, acidification
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This note was uploaded on 03/08/2011 for the course CHEM 101 taught by Professor Hard during the Spring '11 term at UT Arlington.

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8303212-62-Indentifying-Organic - Chem Factsheet...

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