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Why the oxidation of formic acid gives red precipitate while the oxidation of acetic acid not?
I think you are referring to the test using Fehlings solution. Fehlings solution oxidises aldehydes and ketones and formic acid and is in turn reduced. The red precipitate is the copper(I) oxide formed by reduction of the copper(II) complex found in Fehlings solution. Acetic acid is not readily oxidised and so there is no precipitate. See link for more information on what the complex is in Fehlings solution and how it is prepared.
Does hcooh undergo fehlings reaction?
No, formic acid (HCOOH) does not undergo the Fehling's test because it does not contain an aldehyde or ketone group necessary for the reaction to occur. The Fehling's test is specifically used to detect the presence of reducing sugars that possess an aldehyde or ketone functional group.
Which compound gives a lilac colour in a flame test and makes a cream precipitation when silver nitrate is added?
This compound is potassium chloride.
Does Sarcina test positive or negative for the voges-proskauer test?
Sarcina typically tests negative for the Voges-Proskauer test. This test is used to detect the production of acetoin, and Sarcina species do not produce significant amounts of this compound.
An unknown carbonyl compound tested positive when mixed with chromic acid solution it also showed positive results in the iodoform test draw the struture of this compound?
The unknown carbonyl compound is likely a methyl ketone. When reacted with chromic acid, it undergoes oxidation to form a carboxylic acid. In the iodoform test, it forms a yellow precipitate of iodoform (CHI3) due to the presence of a methyl group adjacent to the carbonyl carbon.
What is the fehlings test of glucose?
ulo nyo!!
Why the oxidation of formic acid gives red precipitate while the oxidation of acetic acid not?
I think you are referring to the test using Fehlings solution. Fehlings solution oxidises aldehydes and ketones and formic acid and is in turn reduced. The red precipitate is the copper(I) oxide formed by reduction of the copper(II) complex found in Fehlings solution. Acetic acid is not readily oxidised and so there is no precipitate. See link for more information on what the complex is in Fehlings solution and how it is prepared.
After hydrolysis did sucrose give a positive test with fehlings test why orwhy not?
Sucrose would not give a positive test with Fehling's reagent after hydrolysis because sucrose is a non-reducing sugar. During hydrolysis, sucrose is broken down into its monosaccharide components (glucose and fructose), which are reducing sugars and can react with Fehling's reagent to give a positive test for reducing sugars.
Does phenol give a positive biuret test?
No, phenol does not give a positive biuret test. The biuret test is used to detect the presence of proteins, not phenol. Phenol is a type of organic compound that does not contain the peptide bonds that the biuret test reacts with.
What is the structure of C8H8O compound which gives a positive test of iodoform test and reacts with sodium almagam to yield C8H10O which gave negative iodoform test?
Structure of phenyl acetic acid (C8H8O2) is attached below.
Which halogens give a positive beilstein test?
Chlorine, bromine, and iodine give a positive Beilstein test. The test involves ignition of a compound in the presence of copper oxide, which forms a green flame due to the halogen present in the compound.
Why albumin gives positive Molisch test?
Because it is a carbohydrates and molisch test will be positive in the presence of carbohydrates
Does formalin give positive Fehling's solution test?
Formalin gives a positive Fehling's solution test.
What is a positive result for the fehlings test?
A positive result for the Fehling's test indicates the presence of a reducing sugar such as glucose or fructose in the solution. This is shown by the formation of a brick-red precipitate when the Fehling's reagent is added and heated with the sugar solution.
What is the positive result for molisch test?
all carbohydrates show positive result to Molisch test. this is because Molisch test is used to distinguish carbohydrates from other organic compound.
If a female does cocaine and gives you oral will you test positive for cocaine?
well unless you kissed her or they test your genatiles (male) then you wont be positive
Salicyclic acid gives a positive test with FeCl3?
This is a commonly used test to detect the presence of phenolic hydroxyl groups in organic compounds. The reaction between salicylic acid and FeCl3 forms a complex with a purple color, indicating the presence of phenolic groups in the compound.
