Explain the following observation regarding the IR stretching frequencies of the ketones shown below. 
Definitions:
Interest Periods
Specific intervals of time over which interest is calculated and paid on financial investments or charged on loans.
Rate of Return
The positive or negative return on an investment during a designated period, stated in terms of a percentage of the original investment's expense.
Invest
The act of allocating resources, usually money, in the expectation of generating an income or profit.
Discount Rate
A percentage used to calculate the present value of future cash flows or investments.
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