Question

what is the stretching frequency (in cm⁻¹) of the following carbonyl? 1765 1685 1715 1775

Explanation:

Step1: Identify the carbonyl type

The given carbonyl is an aldehyde. Aldehydes typically have a carbon - oxygen double - bond stretching frequency in a characteristic range.

Step2: Recall the frequency range for aldehyde carbonyls

The stretching frequency of the carbonyl group in aldehydes is around 1720 - 1740 $cm^{-1}$. Among the given options, 1715 $cm^{-1}$ is the closest value to this typical range.

Answer:

1715