Question

what stretching frequencies (in cm⁻¹) are present in the structure below?
1715
1745
1800

Explanation:

Step1: Identify the functional - group

The structure contains an acyl chloride functional - group ($R - CO - Cl$).

Step2: Recall the stretching frequency of acyl chloride

The $C=O$ stretching frequency of an acyl chloride is around 1750 - 1800 $cm^{-1}$.

Answer:

1800