Which type of spectroscopy (IR, UV, or MS) will best distinguish between the pair of compounds below? Give a brief reason. 
Definitions:
Book Value
The net value of a company's assets minus its liabilities, as recorded on the balance sheet.
Return on Total Assets
A financial ratio that measures a company's profitability relative to its total assets.
Total Assets
The sum of all assets owned by a company, reflecting its overall resources, including both current and non-current assets.
Net Income
The total profit of a company after all expenses and taxes have been subtracted from total revenue.
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