Distinguish between 1-butyne and 2-butyne on the basis of the infrared spectrum.

Question:

Distinguish between 1-butyne and 2-butyne on the basis of the infrared spectrum.

IR Spectroscopy:

Infrared or IR spectroscopy is described as a vibrational spectroscopic technique that utilizes the concept of IR absorption due to the vibrations of molecular bonds. This method is used in the identification of functional groups in chemical substances in solid, liquid, or gaseous forms.

Answer and Explanation: 1

1-butyne {eq}C_4H_6{/eq}, an organic compound classified as an alkyne, has two carbon atoms held together by a triple bond located at the end of the molecule. 2-butyne also denoted as {eq}C_4H_6{/eq} and as an organic compound classified as an alkyne, has two carbon atoms held together by a triple bond located in the middle of the molecule.

The structure of 1-butyne and 2-butyne are given below:

When these two compounds are analyzed under IR, 1-butyne will have strong absorption at 3,300 {eq}\rm{cm^-}{/eq} due to the presence of the terminal triple bond, which 2-butyne does not possess.


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Infrared Spectroscopy in Forensics: Definition & Uses

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Chapter 8 / Lesson 10
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Infrared spectroscopy is an examination technique that involves the absorption of infrared light by sample materials with the goal of discovering what they are. This lesson is about infrared spectroscopy and its forensic applications.


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