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Presence of a functional group in a compound can be established by using _____________

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Presence of a functional group in a compound can be established by using _____________

(a) Chromatography

(b) IR spectroscopy

(c) Mass spectroscopy

(d) X-ray diffraction

I got this question during an online interview.

Origin of the question is Vibrational Spectroscopy topic in chapter Absorption Spectroscopy of Engineering Chemistry I

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Right option is (b) IR spectroscopy

The explanation is: Presence of a functional group in a compound can be established by using IR spectroscopy. It is the spectroscopy that deals with the infrared region of the electromagnetic spectrum, that is light with a longer wavelength and lower frequency than visible light.

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