Can you answer all please ! e. Water is denser than CH-Cl, and will be in the bo
ID: 695036 • Letter: C
Question
Can you answer all please ! e. Water is denser than CH-Cl, and will be in the bottom layer. d. CH,Cl, being denser than water will be in the bottom layer Washing the organic layer with 20 mL water will a. Help to complete the reaction b. Maximize the product yield e. Remove non-organic water soluble materials. d. Destroy unreacted NaBH 23. How much drying agent added? a. Add 2-5 g and swirl for 10 min. b. Whatever the instructor says c. Add little and swirl until solid particles floating around d. Add enough to form a clump 24. TLC: circle the most appropriate statement. a. 4-nitro benzyl alcohol is less polar and will have larger Rf value. b. 4-nitro benzyl alcobol is more polar and have smaller Rf value c. Both aldehyde and alcohol will have same Rf value. d. The stationary phase on TLC will strongly bond to the less polar aldehyde 25. Which one of the following statement is not false? 30% ethyl acetate and 70 % petroleum ether is used as mobile phase. b. Ethyl acetate is more polar than petroleum ether. c. Petroleum ether is more polar than diethyl ether. d. Petroleum ether has lower boiling point than diethyl ether 26. Which statement is true? On the TLC, intermolecular attraction between a. SM and silica is stronger than that of CP and SiO, b. SM and silica is weaker than that of CP and SiO c. SM and silica is equal to that of CP and Sio 27. About IR spectra of SM and product. Circle one of the following most appropriate statement. a. SM will show stretching frequencies at 1600, 1700, 2900, and 3100 b. Product will show stretching frequencies at 1600, 1700, 2900, and 3400 c. SM will show stretching frequencies at 1600, 2900, and 3400 d. Product will show stretching frequencies at 1600, 1100,3100, and 3400 28. In the above experiment ifa student made 099 mmol of product. The % yield is: a. 131.3% b, 1.30 % c. 76.15% d, 99.0%Explanation / Answer
22. Washing with 20 ml water would,
c.
water soluble impurties dissolve in added water and gets removed with it.
23. Amount of drying agent needed,
c.
The drying agent absorbs water from solution.
24. TLC statement,
b.
alcohols are more polar as it can bind to stationary phase by polar group interaction
25. True statement,
b.
petroleum ether is mixture of saturated hydrocarbon with only C and H and thus are non-polar solvent
26. True statement regarding tlc,
b.
product alcohol can bind strongly to stationary phase by polar interaction
27. True statement regarding IR spectrum of SM and product
a.
aldehyde shows peak for carbonyl at 1700 cm-1, which is absent in product alcohol.
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