Propose possible structures consistent with each set of data. Assume each compound has an sp3 hybridized C – H absorption in its IR spectrum, and that other major IR absorptions above 1500 cm-1 are listed.a. a compound having a molecular ion at 72 and an absorption in its IR spectrum at 1725 cm-1b. a compound having a molecular ion at 55 and an absorption in its IR spectrum at ~2250 cm-1c. a compound having a molecular ion of 74 and an absorption in its IR spectrum at 3600–3200 cm-1

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Asked Dec 27, 2019
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Propose possible structures consistent with each set of data. Assume each compound has an sp3 hybridized C – H absorption in its IR spectrum, and that other major IR absorptions above 1500 cm-1 are listed.
a. a compound having a molecular ion at 72 and an absorption in its IR spectrum at 1725 cm-1
b. a compound having a molecular ion at 55 and an absorption in its IR spectrum at ~2250 cm-1
c. a compound having a molecular ion of 74 and an absorption in its IR spectrum at 3600–3200 cm-1

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Expert Answer

Step 1

(a) The molar mass of the molecule that needs to be identified is 72 g/mol. The absorption at 1725 cm-1 is corresponding to a carbonyl group. So, the molecule can be a ketone or an aldehyde but there is no characteristic absorption of C-H of the aldehydic group is given. Hence, the possible structure of the compound is as follows:

Chemistry homework question answer, step 1, image 1
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Step 2

(b) The peak at 2250 cm-1 is the characteristic peak of nitrile (-CN). The structure of a nitrile compo...

Chemistry homework question answer, step 2, image 1
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