Question

what is the stretching frequency (in cm^-1) of the following carbonyl?

o
oh

1775
1685
none of the above
1715
1745

Explanation:

Step1: Identify the carbonyl type

The given compound is a benzoic - acid, which is a carboxylic acid. Carboxylic - acid carbonyls have characteristic stretching frequencies.

Step2: Recall the frequency range

The stretching frequency of a carboxylic - acid carbonyl is typically in the range of 1700 - 1720 $cm^{-1}$.

Answer:

D. 1715