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:

Question

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.

Below is the mass spectrum of an unknown hydrocarbon. In addition, this hydrocarbon shows characteristic absorption at 2100 cm<sup>-1</sup> 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 C<sub>4</sub>H<sub>6</sub>, which has two degrees of unsaturation. Possible structures for this formula are:

(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:

Quizplus · Accepted Answer

The Answer is <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB4942/11eaab00_5413_4511_a4b8_7f099a247342_TB4942_00_TB4942_00.jpg" alt="  The IR data is consistent with an internal alkyne, so the compound is but-2-yne." class="answers-bank-image d-block" rel="preload" > The IR data is consistent with an internal alkyne, so the compound is but-2-yne.

Below Is the Mass Spectrum of an Unknown Hydrocarbon