1. (1 pt.) The instrument that is used to measure the optical activity of a comp
ID: 893107 • Letter: 1
Question
1. (1 pt.) The instrument that is used to measure the optical activity of a compound is called a a. actimeter b. optimeter c. polarimeter d. spectrometer 2. (1 pt) A bottle of 1-penten-3-ol CH2 CHCHOHCH2CH, indicates that it has a specific rotation of-42.0°. You weigh out 4.890 grams of the sample and dissove it in ethanol to give a total volume of 25.00 mL of solution. You then take some of the solution and place it into a polarimeter cell whose length is 20.00 centimeters. What is the observed rotation of the sample? Show your calculation. 3. (1 pt.) What would be the observed rotation of a solution of 4.890 g of the enantiomer of the 1-penten-3-ol (from the above problem) in 25.00 mL of ethanol solution? 4. (1 pt.) Treating the sample of 1-penten-3-ol CH2-CHCHOHCH-CH, (specific rotation of- 42.0) with excess H2 in the presence of a palladium catalyst generates a new organic product, 3-pentanol. Provide the structure of this compound. What is its observed rotation? 5. (1 pt) Explain how you determined the observed rotation of 3-pentanol in question 4 Does this indicate the 3-pentanol is optically active? Why or why not? (over)
Explanation / Answer
1) Spectrometer
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