n an IR spectrum, a strong peak at around 1600 cm-1 is indicative of a) C=O stretching b) C-H stretching c) N-H bending d) O-H stretching

To identify what a strong peak at around 1600 cm$^{-1}$ in an IR spectrum indicates, we can analyze the options based on known IR absorption ranges.

1. Understanding the Ranges:

   • C=O stretching typically appears around 1700 cm$^{-1}$ to 1750 cm$^{-1}$.
   • C-H stretching usually occurs in the range of 2800 cm$^{-1}$ to 3000 cm$^{-1}$.
   • N-H bending (or deformation) generally has peaks around 1600 cm$^{-1}$ but is often considered slightly lower.
   • O-H stretching typically appears in the range of 3200 cm$^{-1}$ to 3600 cm$^{-1}$.

2. Analysis of the Peak:

   • The peak at approximately 1600 cm$^{-1}$ is relatively low for C=O and C-H stretches.
   • However, it can also indicate N-H bending, as this type of vibration can sometimes fall within similar ranges.

3. Conclusion:

   • Evaluating the options listed, option (c) N-H bending is the most appropriate answer given the presence of the peak around 1600 cm$^{-1}$ in an IR spectrum.

Final Answer

The strong peak at around 1600 cm$^{-1}$ is indicative of c) N-H bending.