what stretching frequencies (in cm^-1) are present in the structure below? o 3300 none of these all of these…
what stretching frequencies (in cm^-1) are present in the structure below? o 3300 none of these all of these 1685
Answer
Explanation:
Step1: Identify functional groups
The structure has an amide ($-CONH_2$) and a cyclo - hexane ring. The amide group has characteristic stretching frequencies.
Step2: Recall amide stretching frequencies
The $N - H$ stretching of primary amides occurs around 3300 - 3500 $cm^{-1}$ and the $C=O$ stretching of amides occurs around 1630 - 1680 $cm^{-1}$.
Step3: Analyze options
3300 $cm^{-1}$ is in the range of $N - H$ stretching of primary amides and 1685 $cm^{-1}$ is close to the $C=O$ stretching range of amides.
Answer:
all of these