Question

question 1
which statement is false?
a. coumarins can not be found in nature. we must synthesize them in the lab.
b. all coumarins show fluorescence.
c. coumarins have two six - membered rings fused together.
d. coumarins are know for their anti - inflammatory and anti - oxidant properties.
e. all coumarins contain an ester functional group.
chem 1120: introduction to chemistry techniques iclickers
select an answer

Explanation:

• Option A: Coumarins are naturally occurring compounds. They can be found in various plants, so the statement that they cannot be found in nature is false.
• Option B: Not all coumarins show fluorescence. Some do, but it's not a universal property for all coumarins.
• Option C: Coumarins have a benzene ring (six - membered) fused with a pyrone ring (six - membered).
• Option D: Coumarins are known for their anti - inflammatory and antioxidant properties.
• Option E: The coumarin structure contains an ester functional group (formed by the reaction of a phenolic - OH and a carboxylic acid group within the molecule).

Answer:

A. Coumarins can not be found in nature. We must synthesize them in the lab.