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:
Likelihood
The probability or chance that a particular event will occur.
HIV Transmission
The process by which the Human Immunodeficiency Virus (HIV) is spread from one person to another, most commonly through unprotected sexual contact, sharing needles, or from mother to child during birth or breastfeeding.
Living With HIV
The experience of managing life with Human Immunodeficiency Virus, which affects the immune system and can lead to AIDS if not treated effectively.
Precautions
Measures or actions taken in advance to prevent harm or injury, or to ensure safety.
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