Kiko, a Chem 31.1 student, accidentally shuffled two test tubes with different compounds on his way to the laboratory. To confirm the possible identities of the compounds, Kiko added neutral KMnO4 and Lucas reagents to both test tubes labeled A and B. Test tube A gave a brown precipitate in neutral KMnO4 while test tube B produced a purple solution in the same test. Upon subjecting to Lucas Test, both test tubes produced layers. Which of the following are the possible identities of the compounds A and B? a. Sec-butanol and 3-methyl-3-pentanol b. n-propanol and tert-butanol c. isopropyl alcohol and 4-nitrophenol d. hexanol and cyclopentanol

Kiko, a Chem 31.1 student, accidentally shuffled two test tubes with different compounds on his way to the laboratory. To confirm the possible identities of the compounds, Kiko added neutral KMnO4 and Lucas reagents to both test tubes labeled A and B. Test tube A gave a brown precipitate in neutral KMnO4 while test tube B produced a purple solution in the same test. Upon subjecting to Lucas Test, both test tubes produced layers. Which of the following are the possible identities of the compounds A and B? a. Sec-butanol and 3-methyl-3-pentanol b. n-propanol and tert-butanol c. isopropyl alcohol and 4-nitrophenol d. hexanol and cyclopentanol

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter4: Recrystallization

Section: Chapter Questions

Problem 1Q

See similar textbooks

Similar questions

In glucose estimation using Benedict's Reagent, briefly explain what would happen if the water evaporates completely and is not immediately replaced and what effect this will have on the calculated titer of Benedict's reagent.
Which of the following observations is INCORRECT? a. 4-aminophenol: wine red solution in FeCl3 b. Phenol: white precipitate in Br2 in water c. 3,5-dimethyl-1-hexanol: No layer formation in Lucas reagent d. 3,6-dihydroxycycloheptanone: decolorization of solution in KMnO4 test
What is the purpose of performing a blank titration in the assay of ibuprofen? A. To determine the amount of titrant that would react with the indictor. B. To determine the amount of titrant that would react with ibuprofen. C. To determine the amount of titrant that would react with potassium hydrogen phthalate. D. To determine the amount of titrant that would react with free acid in the solvent.
the eugenol and water distillate you collect is apt to be cloudy, particularly the first part of this distillate. Explain why.
What is the role of Glycerin in the assay of Boric Acid?I. The reagent prevents the formation of pink color earlier than the expected endpoint.II. The reagent allows the reaction of protons from the acid sample with the hydroxyl ions from the titrant.III. It enhances the water solubility of the difficultly soluble boric acid. a. I, II & III b. II & III c. I & II d. I only e. I & III
A 300-mL aqueous solution containing a 30.0g of compound A is to be extracted with ether. The solubility of compound A in ether at room temperature is 20.0g/mL and in water is 8.00g/mL. Calculate the weight of the compound that would be recovered by extraction with (a) two 150-ml portions of ether (b) one 300-mL portion ether. Which portion gives a higher recovery for compound A?
For a Kjeldahl analysis: you weighed 0.0312 g unknown dried blood sample and digested it with concentrated H2SO4. After the distillation into boric acid solution, Methyl Purple indicator changed its color to green. During titration with 0.0110 M H2SO4 it took 15.35 mL of this H2SO4 solution to bring the color of the mixture to grey-blue. a) What number of moles of H2SO4 reacted? b) What number of moles of boric acid reacted with NH3 during distillation? c) What number of moles of NH3 was produced during distillation? d) What was mass of N in the produced NH3? e) What is %N w/w in the original sample?
1,4‐Dimethoxybenzene (0.642 g) was dissolved in 2.0 mL acetic acid in a 25 mL Erlenmeyer flask using heat from a hot plate. Once the solid dissolved, 1.0 mL tert‐ butanol was added, and the reaction mixture was cooled in an ice bath. Then 2.0 mL concentrated sulfuric acid was added in 2‐3 drop portions,stirring the mixture after each aliquot. After the addition, the flask was removed from the ice bath and allowed to sit at room temperature for 15 minutes. Then 1.0 mL water was added dropwise to dilute the acid and the reaction mixture was added to 40 mL cold water in a 100 mL beaker. The solid was vacuum filtered and washed with 5 mL cold water, giving 52 g filtrate. The product wasrecrystallized from 4.5 mL methanol, yielding 0.317 g purified 1,4‐di‐tert‐butyl‐2,5‐dimethoxy benzene (27.2% yield). What is the atom economy, e-factor, and effective mass yield?
1. Basically, when is glass stoppered buret used? ______________________________ ____________________________________________________________________ When is rubber stoppered buret used? ____________________________________ ________________________________________________________________________________________________________________________________________ When is a PTFE buret used? _________________________________________________________ _ _________________________________________________________________________________ 2. Describe the recommended method for the manipulation of a buret stopcock during titration. ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ 3. Why is it necessary to completely fill the rubber tubing of the stopcock with the…
Following the monograph procedure, a 724-mg of aspirin (MW+180 g/mol) dissolved in 18.5 ml of cold neutralized alcohol. This solution was then initially titrated with 0.101 N sodium hydroxide solution, then later neutralized with 0.104 sulfuric acid. 1. What is the milliequivalent weight consumed by the acidic titrant? a. 1.5392 g-meq b. 2.0907 g-meq c. 1.4948 g-meq d. 2.1528 g-meq 2. What is the milliequivalent weight consumed by the basic titrant? a. 5.8656 g-meq b. 1.5392 g-meq c. 5.6964 g-meq d. 1.4948 g-meq 3. What is the difference of milliequivalent weight consumed in the reaction? a. -4.1572 g-meq b. 4.3708 g-meq c. 0.5515 g-meq d. 4.1572 g-meq
The Coca- cola is diluted and reacted with molybdate/metavanadate reagent before the %T is measured. True or False?
An organic chemistry laboratory Extraction; the extraction of crude naphtalene- benzoic acid mixture. Naphthalene is a suspect carcinogen and is toxic to aquatic life. Find an alternative pair of molecules that adhere better to the principles of green chemistry and can be separated by extraction using green' solvents. (kindly answer fully)