3. What is a positive test for the 2,4-DNP test with an aliphatic ketone? (2 points)...
An unknown substance had a positive reaction with 2,4-DNP test. The unknown reacted like a secondary alcohol with the Lucas reagent. It was negative with the Iodoform and Benedict's test. What possible functional groups does the unknown contain? -primary alcohol -secondary alcohol -tertiary alcohol -ketone -aldehyde -methyl -none tested I answered ketone and aldehyde. I did not receive full credit. I also answered secondary, tertiary, ketone, and acetone, but did not receive full credit.
Test Performed Observations Conclusion for Particular Test: Aldehyde/Ketone/Inconclusive (1 pt) Shiff's reagent (1 pt) Tollen's reagent appearance of a dark pink color in solution formation of a silver/grey precipitate formation of a red precipitate fcmation of a bright orange / red precipitate Fehling reagent (1 pt) 2,4-DNP (3 pt) Melting point range of 232 - 235°C 2,4-DNP derivative ID of unknown: pts) 24. Based on the observations / results given in the table below, and by consulting Table 1 on...
Which sample(s) gave a positive result for the 2,4-DNP test? tert-butanol formaldehyde cyclohexanone acetone
b. Draw the product when a ketone is treated with 2,4-DNP in the presence of catalytic acid O2N NO2 H2NHN HO* (cat.) R c. Draw a complete mechanism for this reaction. Include curved arrows, all reactive intermediates, and elementary step labels above each step
experiment 24 2 What one test (not using the semicarbazone or 2,4-DNP derivatives) could be used to differentiate between the following pairs? Describe what you would observe. a) 2-Pentanone and 3-pentanone b) Pentanal and 3-pentanone e) 1-Propanol and 2-propanol
#106 1. 2,4-DNP Test 2. Silver Mirror tert 3. Chromic acio / Shiff's Reagent 4. Iodo form test
2. Put rescine and cadaverine are short aliphatic diamine compounds produced during the breakdown of amino acids in both living and dead organisms. What tests, including solubility, would you run in order to confirm their structure? Which of the following halide-containing compounds will not react in the silver nitrate test? 3. Cl Cl 4. A certain unknown compound with a sweet smell was found to be soluble in concentrated sulfuric acid. After a positive 2,4-DNP test and chromic acid oxidation...
5) You have been given an unknown that gives a positive 2,4-dinitrophenylhydrazine test. a) What does this positive 2,4 DNP test indicate? b) What subsequent tests could you run to be more specific about the unknown's identity? c) What would you see in the subsequent tests, and what would your observations tell you about the identity of the unknown?
1. (6 pts) These are some of the preliminary tests that you will be doing on days 1-2. For each test, write down what type of molecule would give a positive test and what a positive result would look like. DNP: Solubility Beilstein: Ignition: 2. (2 pts) For the 2,4-dinitrophenylhydrazine test, write a chemical reaction between that reagent and one of the "known" compounds that would give a positive result. 17 1. (6 pts) These are some of the preliminary...
je 2.4-dinitrophenylhyd 5) You have been given an unknown that gives a positive 2,4-dinitrophen a) What does this positive 2,4 DNP test indicate? b) What subsequent tests could you run to be more specific about the un identity? c) What would you see in the subsequent tests, and what would your observa about the identity of the unknown?