Topic: Test for Aldehydes
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Answers to Common Questions
What is Tollen's aldehyde test?
( ′täl·ənz ′al·də′hīd ′test ) (analytical chemistry) A test that uses an ammoniacal solution of silver oxides to test for aldehydes and ketones. Read More »
Source: http://www.answers.com/topic/tollen-apos-s-aldehyde-test
What is the principle of tollen's test for aldehydes?
I'm not sure, but tollens test use <Ag(NH 3 ) 2 > + OH - IF it passed oxidation, so it was a aldehyde a keton group needs a stronger oxi. reagent Read More »
Source: http://wiki.answers.com/Q/What_is_the_principle_of_tollen's_test_...
Which of the following is a test for aldehydes?
fehling test do very well in looking for aldeydes. The Fehling solution (eg Sulfuric acid) readily oxidize aldehyde's into carboxylic acids and a red precipitate. Flame will burn any hydrocarbon acid test is for alcohols and butler test I d... Read More »
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Answers to Other Common Questions
aldehydes are easily oxidixed into organic acids. You can do these reactions with an indicator compound of some sort: R-CO-H -> - C(NH)-H On the reference page - Tollen's Test: 2Ag(NH3)2(OH) + R-COH -> 2 Ag + R-COO(-) NH4(+) + H2O + 3NH3 cr...
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2,4-dinitro phenyl hydrazine form yellow ppts. with aldehyde and ketone on heating.
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Fehling's Solution is used to test for the presence of aldehy...
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Compounds with reducing groups give this test. Ketones do not respond to this test while aldehydes give this test.
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Source: http://uk.answers.yahoo.com/question/index?qid=20111007095400AAqc...
Add sodium bi-carbonate (NaHCO3) to both the test tubes, one containing an aldehyde and the other a carboxylic acid. You will observe that there is no reaction in one test tube while in the other test tube there will be brisk effervescence....
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Source: http://uk.answers.yahoo.com/question/index?qid=20090220124805AARM...
tollen's only reacts with aldehydes, which are oxidized to carboxylic acids. as you know, ketones cannot be oxidized. the silver (+) in the reagent is reduced to elemental silver, and appears like a mirror surface. the reaction equation is ...
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Source: http://answers.yahoo.com/question/index?qid=20080318100820AAFzUl6
Chemical tests: One test commonly to identify the presence of an aldehyde or ketone type carbonyl group is called the 2,4-DNP test. This is an acidic(H2SO4) solution of 2,4-dinitrophenylhydrazine. Typically a small sample of the suspect com...
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Source: http://answers.yahoo.com/question/index?qid=20090421192837AAkEJpE
