Why do trioses and tetroses give negative result for the Molisch’s Test? Explain with the help of necessary chemical structures or minimal reaction blocks. Also mention Why do some organic acids like citric acids, lactic acid, etc. give positive result for Molisch’s Test?
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Why do trioses and tetroses give negative result for the Molisch’s Test? Explain with the help of necessary chemical structures or minimal reaction blocks. Also mention Why do some organic acids like citric acids, lactic acid, etc. give positive result for
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- An unknown carbohydrate gave a brick-red precipitate when tested with Fehling’s reagents, turned red when reacted with Seliwanoff’s reagent, and quickly gave a red precipitate with Barfoed’s reagent. What conclusion can be made about this carbohydrate?Why do ketoses go dehydration reaction much faster than aldoses in Seliwanoff’s test when aldehyde reacts faster than ketoses? Kindly explain in a comprehensive manner.An unknown carbohydrate gave a brick red precipitate when tested with Fehling’s reagent, turned red when reacted with Seliwanoff’s reagent, and quickly gave a red precipitate when reacted with Barfoed’s reagent. What conclusions can be made about this carbohydrate?
- An unknown carbohydrate turned red when reacted with Seliwanoff’s reagent and quickly gave a red precipitate when reacted with Barfoed’s reagent. What conclusions can be made about this carbohydrate?Given ß- Cyclodextrin, Briefly explain its expected reaction (based on their structural formula) to the different qualitative tests for carbohydrates which are: (a)Barfoed’s test (b)Seliwanoff’s test (c) Iodine’s testIn solution, glucose exists predominantly in the cyclic hemiacetal form, which does not contain an aldehyde group. How is it possible for mild oxidizing agents to oxidize glucose?
- In the acid- catalyzed hydrolysis of starch, how can you tell when the hydrolysis of starch is complete, why does the test work this way? What is the monosaccharide at the end?Given ß- Cyclodextrin Briefly explain its expected reaction (based on their structural formula) to the different qualitative tests for carbohydrates which are: (a) Molisch’s test (b)Fehling’s test (c) Bial’s testWhat inferences can be made from the Benedict’s test of the hydrolysates of the following? Was the acid treatment able to hydrolyze the sugars? a. sucroseb. starchc. cellulose
- Give the reagent or chemical test that would differentiate the following pairs of compounds. Write chemical equations for the reactions. List of Chemical Tests (choose here)I. Halogenation: Bromination with and without lightII. Oxidation: Reaction with Baeyer’s reagent III. Reaction with Ammoniacal Silver Nitrate (AgNO3) or simply Tollen’s reagent a. benzene and ethylbenzeneb. 1-butyne and 2-butynec. 2-methylpentane and 2-methyl-2-pentened. toluene and 1-methylcyclohexeneWhat test reagent is most sensitive in detecting sugar in urine? What are the possible positive results (color) and its interpretation? What test could be used to differentiate: sucrose and lactose? Explain. glucose and starch? Explain. glucose and fructose? Explain. galactose and fructose? Explain An unknown carbohydrate gave a brick red precipitate when tested with Fehling's reagent, turned red when reacted with Seliwanoff's reagent, and quickly gave a red precipitate when reacted with Barfoed's reagent. What conclusions can be made about this carbohydrate? Illustrate with equation the reaction of glucose, galactose, maltose & lactose with osazone test. Sketch the crystals formed for each of the following sugars examined under the microscope.What is the chemical equation for ribose when it undergoes the Molisch Test?