Below is the mass spectrum of an unknown hydrocarbon. In addition, this hydrocarbon shows characteristic absorption at 2100 cm-1 in its IR spectrum. Give the structure of this unknown. 
(Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/)
The formula weight of 54 corresponds to a molecular formula of C4H6, which has two degrees of unsaturation. Possible structures for this formula are:
Definitions:
Risk-Free Rate
The theoretical rate of return of an investment with no risk of financial loss, typically associated with government bonds.
Market Risk Premium
The additional return an investor expects to receive from holding a risky market portfolio instead of risk-free securities.
Beta Coefficient
A measure of a stock's volatility in relation to the overall market, used in the Capital Asset Pricing Model to determine the expected return of the asset.
Systematic Risk
The danger that affects the whole market or a specific segment of the market, commonly referred to as market risk.
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