Question

what stretching frequencies (in cm⁻¹) are present in the structure below?
2000
none of these
all of these
1715

Explanation:

Step1: Identify functional groups

The structure contains an ester functional - group (R - CO - O - R').

Step2: Recall ester C=O stretching frequency

The C=O stretching frequency of an ester is typically around 1735 - 1750 cm⁻¹ for aliphatic esters and 1715 - 1730 cm⁻¹ for aromatic esters. In this case, considering the structure, the C=O stretching frequency is likely around 1715 cm⁻¹.

Answer:

1715