Experiment 29 REAC 4 472 modu program edior ular laboratory program in chemistry

Question

Experiment 29 REAC 4 472 modu program edior ular laboratory program in chemistry Qualitative Tests for Alkenes prepared by Robert G. Silberman, SUNY, Cortland Purpose of the Experiment Use pyridinium bromide perbromide (PBP) and potassium permanganate to distinguish alkenes from alkanes and aromatic compounds. Test seven known and two unknown compounds for unsaturation. Background Information is the kind of carbon-to-carbon bond each contains. Alkanes have only single carbon-to-carbon bonds ikynes, and aromatic compounds (C-C). Having single C-C bonds means that alkanes solely of hydrogen cannot further react with hydrogen, and are satu- and carbon atoms. They are therefore called hydro- rated. Alkenes contain at least one carbon-to-car ns. Table 1 shows that the essential difference bon double bond (CeC) and react with hydrogen un- among these four types of hydrocarbons, besides the der the right conditions. Thus, alkenes are said to be number of hydrogen and carbon atoms they contain, unsaturated. Alkynes, also unsaturated, contain a Alkanes, alkenes, al are organic compounds consisting carbo Table 1 Carbon bonding in alkanes, alkenes, alkynes, and aromatic compounds type of hydrocarbon carbon bond type aturation status example alkane single (C-C saturated alkene double (C-c) unsaturated triple (C C) unsaturated alkyne ethyne shared electrons unsaturated aromatic benzene compound Resources, Inc., P.O. Box 357,220 S. Railroad, Palmyra, Pennsylvania 17078 Copyright 0 1996 by Chemical Education No part of this laboratory program may be reproduced or transmited in oopying, recording, or any information storage and retrieval syatem, any form or by ary means, electronic or mechanical, including photo- without permission in writing from the publisher. Printed in the United States 00 99 98 97 96 15 14 13 12 11 10 9 87654 321 of America

Explanation / Answer

A:- Test for Unsaturation with Bromin water: 0.2 ml of organic compound is dissolved in 2 ml of CCl4 then 0.1 ml of bromine water is added dropwise. If brown colour of bromin dischared => unsaturation is present (or) If brown colour of brown not dischared => unsaturation is not present.

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