what is the stretching frequency (in cm⁻¹) of the following carbonyl?\no 1685\no 1655
what is the stretching frequency (in cm⁻¹) of the following carbonyl?\no 1685\no 1655
Answer
Explanation:
Step1: Identify the carbonyl type
The given compound is an amide with conjugation. Conjugation lowers the carbon - oxygen double - bond stretching frequency.
Step2: Recall amide and conjugated carbonyl frequencies
Amide carbonyls typically have stretching frequencies around 1650 - 1690 cm⁻¹. Conjugation further lowers the frequency. For a conjugated amide, the carbonyl stretching frequency is closer to 1655 cm⁻¹.
Answer:
1655