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 compound containing C, H, and O exhibits strong, broad absorption band at 3430 cm i, a sharp band at 3300, and a band at 2200 cm i (m) Relative absorption intensit (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 (Enter letters from the table below, in any order, with no spaces The functional class(es) of this compound is(are) or commas.) a. alkane (List only if no other functional class applies.) b. alkene h. amine i. aldehyde or ketone c. terminal alkyne d. internal alkyne j. carboxylic acid k. ester e. arene l. nitrile alcohol g. ether

Explanation / Answer

For Q1.

Recall that

For a broad peak at 3420 cm^-1 = we typically associate this with an OH group, i.e. alcohol;

For,

the sharp band at 3300 cm^-1 = typically an alkyne, that is C(triple)C stretch

As stated, only C,H,O are present so this makes sense with our interpretation

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