Question: Linolenic acid (Table 10.2) and stearidonic acid are omega-3 fatty acids, unsaturated fatty acids that contain the first double bond located at C3, when numbering begins at the methyl end of the chain. Predict how the melting point of stearidonic acid compares with the melting points of linolenic and stearic acids. A current avenue of research is examining the use of soybean oil enriched in stearidonic acid as a healthier alternative to vegetable oils that contain fewer degrees of unsaturation.
Srearidonic acid has the lowest melting point, linolenic acid has the intermediate melting point, and stearic acid has the highest melting point.
Melting point is the temperature at which the solid and the liquid state of a substance co-exist at equilibrium.
The melting point depends on the following:
The double bonds decrease the melting point of a substance.
Stearidonic acid has four double bonds, linolenic acid has three double bonds, and stearic acid does not have any double bonds. Thus, stearidonic acid has the lowest melting point, linolenic acid has an intermediate melting point, and stearic acid has the highest melting point.
Question: a. What product(s) are formed when the E isomer of C6H5CH=CHC6H5 is treated with Br2 , followed by one equivalent of KOH? Label the resulting alkene(s) as E or Z. b. What product(s) are formed when the Z isomer of C6H5CH=CHC6H5 is subjected to the same reaction sequence? c. How are the compounds in parts (a) and (b) related to each other?
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