Test: Physical Chemistry

1.

Alkynes exhibit a distinctive peak in the  region of an IR spectrum, caused by the stretching of the triple bond. After performing a synthesis of ethyne in the laboratory, she takes an infrared spectrum of the synthesized compound and no such peak appears. Which of the following statements best explains the reason for this phenomenon? 

The instrument is malfunctioning; ethyne should definitely show a peak at 

There was not enough sample for the detector to read

Ethyne does not contain triple bonds

The compound synthesized was not ethyne, and therefore the IR spectrum is incorrect

Ethyne is has a center of symmetry about its triple bond, making it IR inactive

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