Question

question 13
what is the stretching frequency (in cm⁻¹) of the following carbonyl?
1745
1715
none of the above
1685

Explanation:

Step1: Identify the carbonyl type

The given carbonyl is an aromatic - conjugated ketone.

Step2: Recall the stretching frequency range

Aromatic - conjugated ketones typically have carbonyl stretching frequencies in the range of 1680 - 1660 $cm^{-1}$.

Answer:

1685