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Home/ Questions/5. Examine the IR below and classify the compound. A. Alkane B. Carboxylic acid C. Alcohol...
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Asked: April 11, 20222022-04-11T18:44:02+00:00 2022-04-11T18:44:02+00:00In: Chemistry

5. Examine the IR below and classify the compound. A. Alkane B. Carboxylic acid C. Alcohol…

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5. Examine the IR below and classify the compound.
A. Alkane
B. Carboxylic acid
C. Alcohol
D. Alkene
♦ Relevant knowledge
Vibrational Spectroscopy

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Vibrational spectroscopy can also be referred to by the name of infrared spectroscopy (IR). In this kind of spectroscopy, a substance takes in IR radiation. The compounds that absorb IR radiations have a net null dipole moments. Functional groups absorb certain frequencies within the IR spectrum. The stretching between atoms is seen as C-H observed in the alkane (gives moderately high peaks). The bending between atoms can also be seen, but the peak are not as sharp.

alkanecarboxylic acidir
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    Emily O'Kelly
    2022-04-12T00:14:49+00:00Added an answer on April 12, 2022 at 12:14 am

    In infrared spectrum (IR) Functional groups absorb at a specific wavenumber.

    A) Alkane absorbs at a frequency of 300 – 2840 cm-1 because of carbon – hydrogen stretching. Alkanes are saturated substances.

    B) Carbocylic acid is absorbed at a specific frequency of 1760 cm-1 because of carbonyl carbon inside carboxylic acid. -OH group of carboxylic acid absorbs at 3300-2500cm-1. It produces a strong and broad spectrum in the IR spectrum.

    C) Alcohols are functional groups that contain the -OH group. It is absorbed by 3700-3200 cm-1.

    D) Alkene are an aliphatic chain with a double bonds between two carbons. It is absorbed at 3100-3000 cm-1.

    Answer: C. Alcohol

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