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Grade 12Organic Chemistry

which group of compounds give positive test for tollens test, fehling solution ,schiffs reagent,iodoform test.and under which conditions they give the test

Profile image of hemanth
11 Years agoGrade 12
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3 Answers

Profile image of ng29
11 Years ago
tollen test
only aldehydes give this test , ketone doesnt give dis test
in this we take AMMONICAL SILVER NITRATE(AgNO3+NH4OH) , it is mild oxidising agent and oxidise aldehyde
in this silver mirror is formed of Ag+
 
fehling solution
it consistts of two parts     fehling A – Copper sulphate
                                       fehling B --Sodium ptassium tartrate
it oxidise only aliphatic aldehydes not aromatic
in this red ppt of Cu2O is formed
 
Schiff reagent
it is Pararosa anniline + SO2  + HCl
both aliphatic and aromatic aldehyde give dis test
in this pink color will be restored on reaction wid aldehyde
 
approve if useful
Profile image of ng29
11 Years ago
iodoform test
given by compound of form CH3-CH-G   AND  CH3-C-G
                                                 OH                     O
 WHERE G is any group except OH, OCH3, NH2
in this reagent used is I2+NaOH/ NaOI   IODOFORM is produced in end of rxn (in case of iodine)
 
 
approve if useful
 
Profile image of ng29
11 Years ago
in iodornm test    
OH  AND  O   REPRESENTS ALCOHOL AND KETONIC PART in compunds that i have written
as it was difficult to write it

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