Question

what stretching frequencies (in cm⁻¹) are present in the structure below? 1715 1685

Explanation:

Step1: Identify the functional - group

The structure contains an aldehyde functional - group ($-CHO$).

Step2: Recall aldehyde $C=O$ stretching frequency

The $C = O$ stretching frequency of an aldehyde is typically around 1720 - 1740 $cm^{-1}$ for aliphatic aldehydes. In this case, the structure is an aliphatic aldehyde attached to a cyclohexane ring. The value closest to the typical range is 1715 $cm^{-1}$.

Answer:

1715