Question

question 10
what stretching frequencies (in cm⁻¹) are present in the structure below?
3095
all of these
3300
1685
none of these

Explanation:

Step1: Analyze C - H stretching in aromatic ring

Aromatic C - H stretching occurs around 3030 - 3100 cm⁻¹. 3095 cm⁻¹ is in this range.

Step2: Analyze O - H stretching in carboxylic acid

The O - H stretching of a carboxylic acid is broad and occurs around 2500 - 3300 cm⁻¹. 3300 cm⁻¹ is in the possible range for O - H stretching of carboxylic acid.

Step3: Analyze C=O stretching in carboxylic acid

The C=O stretching of a carboxylic acid occurs around 1680 - 1720 cm⁻¹. 1685 cm⁻¹ is in this range.

Answer:

B. all of these