Question

Repeat Question $19-21$for the case when the protons are not decoupled. Note that ${}^{13}C-{}^{1}H$coupling constants are generally in the range of $100$to $200$Hz.

Short answer

(a)

(b)

(c)

Step-by-step solution

Define spectral resolution.

The ability of a sensor to define precise wavelength intervals is referred to as spectral resolution. Their great spectral resolution allows for detailed identification of targets based on their spectral response in each of the narrow bands.

Predict the appearance of the high-resolution C13 spectrum of methyl formate.

The proton coupled ${}^{13}C^{NMR}$spectrum of acetaldehyde forms a doublet at $~200\delta$for the carbonyl carbon and another peak is formed at $~31\delta$for the methyl carbon.

Predict the appearance of the high-resolution C13 spectrum of acetaldehyde.

One peak is shown at $~200\delta$for the carbonyl carbon. Another peak is shown at at $~31\delta$for the methyl carbon.

The acetaldehyde spectrum is depicted in the diagram below.

Predict the appearance of the high-resolution C13 spectrum of acetone.

A peak for acetone are shown at $~200\delta$for the carbonyl carbon and a peak at $~31\delta$for the methyl carbon.

The acetone spectrum is depicted in the diagram below.