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/)
Definitions:
Labor Unions
Organizations formed by workers to collectively negotiate with employers for better wages, working conditions, and benefits.
Sherman Anti-Trust Act
The Sherman Anti-Trust Act is a landmark U.S. legislation passed in 1890 that prohibits monopolies and other activities that restrict competition.
United Auto Workers
A labor union in the United States representing workers in the automotive industry.
International Brotherhood
A term that can refer to solidarity among different nations or peoples, or to specific organizations aiming to promote such solidarity.
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