1. How would the following actions effect both the yield AND the purity of your
ID: 888518 • Letter: 1
Question
1. How would the following actions effect both the yield AND the purity of your recrystallized trans-1,2-dibenzoyl ethylene
a. The dichloromethane solution is not treated with activated carbon
b. The crude crystals are not completely dissolved in the dichloromethane before filtering the activated carbon.
c. The 1 ml dichloromethane rinse is not applied to your flask and filter column
d. The crystals are not completely dissolved in hot ethanol before recrystallizing the trans-1,2-dibenzoylethylene
2. Based on the structures of cis- and trans-dibenzoylethylene, which isomer would you expect to be more polar? What physical properties would be affected by the differences in polarity between the two isomers?
Explanation / Answer
C&D are correct
2. cis form is more polar because dipole moment is not zero but trans dipolmement is zero
melting point and boiling point, stability
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