The functional groups in an organic compound can frequently be deduced from its

Question

The functional groups in an organic compound can frequently be deduced from its infrared absorption spectrum. A nitrogen-containing compound exhibits no absorption above 3000 cm-1 but does exhibit a band of medium intensity at 2250 cm-1.
Relative absorption intensity: (s)=strong, (m)=medium, (w)=weak.

What functional class(es) does the compound belong to?
List only classes for which evidence is given here. Attach no significance to evidence not cited explicitly.
Do not over-interpret exact absorption band positions. None of your inferences should depend on small differences like 10 to 20 cm-1.

The functional class(es) of this compound is(are).(Enter letters from the table below, in any order, with no spaces or commas.)

a. alkane (List only if no other functional class applies.) b. alkene h. amine c. terminal alkyne i. aldehyde or ketone d. internal alkyne j. carboxylic acid e. arene k. ester f. alcohol l. nitrile g. ether

Explanation / Answer

Given the nitrogen containing organic compound exhibits no absorption above 3000 cm-1, but a exhibits a band of medium intensity at 2250 cm-1.

Since nitrile has a medium stretch at at 2250 cm-1, hence the organic compound belongs to the class of nitriles.

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