Which of the following compounds will not display a carbonyl carbon signal in the DEPT-90 and DEPT-135 13C NMR spectroscopy? 
Definitions:
Equilibrium Price
The price at which the quantity of goods demanded is equal to the quantity of goods supplied, resulting in a stable market condition.
Surpluses
Surpluses occur when the quantity of a good or service supplied exceeds the quantity demanded, often leading to a decrease in prices.
Market Prices
The current prices at which goods and services can be bought or sold in a marketplace.
Rationing Function
The process by which the market system allocates goods and services to consumers when supply is limited.
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