Question

what stretching frequencies (in cm⁻¹) are present in the structure below? 1760 and 1830 1745

Explanation:

Step1: Identify the functional groups

The structure has two carbon - oxygen double bonds (C=O) in an ester - like arrangement.

Step2: Recall C=O stretching frequencies

For esters, the C=O stretching frequency is around 1745 cm⁻¹. The 1760 - 1830 cm⁻¹ range is more typical for acid anhydrides.

Answer:

1745