Which is the most likely structure for a compound with molecular formula C5H8O, and an IR spectrum with an intense peak at 1710 cm-1 but no peaks between 3000 and 3050 cm-1? 
Definitions:
Income Yield
The earnings generated and realized on an investment over a particular period of time, typically expressed as a percentage of the investment's cost.
Break Even
The point at which total cost and total revenue are equal, resulting in no net loss or gain for a business.
Total Return
The overall financial gain or loss on an investment, including both capital appreciation and income received.
Income Received
Refers to the total amount of money or assets that an individual or entity receives over a certain period, including wages, dividends, sales proceeds, or benefits.
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