Which one of the following functional groups is found in ketones? 
Definitions:
Par Value
The face value of a bond or the stock value stated in the corporate charter, which is often different from its market value.
Call Feature
A provision in a bond or other fixed-income security that allows the issuer to repurchase and retire its bonds before they reach their specified maturity date.
Coupon Rate
The annual interest rate paid by a bond's issuer to its holders, expressed as a percentage of the bond's face value.
Bond Market
A financial market where participants can issue new debt in the form of bonds or buy and sell debt securities, primarily to and from investors.
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