A strong, broad IR absorption near 3300 cm⁻¹ is characteristic of
- A
C=O stretch
- Bcheck_circle
O-H or N-H stretch (hydrogen-bonded)
- C
Aromatic ring
- D
C-C stretch
Explanation
H-bonded O-H (alcohols, carboxylic acids) gives broad absorbance ~3200-3500 cm⁻¹. C=O is sharp, near 1700 cm⁻¹.