Quiz Bank 4

Quiz Bank 4 - Quiz Bank 4 1. N6-Isopentenyladenine, shown...

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Quiz Bank 4 1. N 6 -Isopentenyladenine, shown below is an unusual base found in RNA. What is its relationship with caffeine? (Experiment 4) 2. What technique is best used to purify a compound that readily forms hydrates and explain why? (Chapter 12) 3. What is the purpose of lowering the pressure in sublimation? (Chapter 12) 4. One hundred milligrams of compound A (K p = 4.15 x 10 -1 ) is dissolved in 2 mL of H 2 O and subsequently extracted with an equal volume of dichloromethane (DCM). What percentage of compound A is recovered from this single extraction? If the resulting aqueous layer is extracted with another 2.0 mL of DCM, what is the total percent recovery based on these two extractions? (Chapter 8) 5. A student accidentally mixes caffeine with benzoic acid. Outline a procedure that could be followed to enable the students to isolate both compounds in relatively pure form. 6. An aqueous solution of compound X (1 mg) in water (100mL) was extracted with chloroform. After extracting, the chloroform layer contained 0.95 mg of
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This note was uploaded on 04/09/2010 for the course CHEM 6a taught by Professor Pettus during the Winter '07 term at UCSB.

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Quiz Bank 4 - Quiz Bank 4 1. N6-Isopentenyladenine, shown...

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