Explain the main modules under “chemical structure” and give examples of structural representations that depict each. 3) The fundamental infrared absorption that indicates the presence of a C-H stretching vibration in a molecule occurs at wavelengths near 3.4 x 10^-6m. Use this information to estimate the force constant of the C-H bond. If the fundamental vibration of an N-H bond stretch occurs near the wavelength 2.9 x 10^-6m. Which of the two bonds would you consider stronger: C-H or N-H?  Explain your answer explicitly.