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- 1- Order the highest to lowest frequency of vibration in the infrared (IR) region of the following infrared groups, justifying the answer based on infrared spectroscopy.The stretching frequencies for H2, HD, and D2 are 4395, 3817, and 3118 cm-1 respectively. Why? Explain.Which molecules below are rotational Raman active and which are inactive. O3 CH4 NH3 H2 H2O SiH4 CF6 C4H10
- state which of the following molecules show a pure rational microwave absorption spectrum and explain why (a) H2O (b) CO2 (c) NH3 (d) N2O (e) Benzene (f) Cl2How many degrees of vibrational freedom does Al2Cl6 possess? Use the D2h character table to determine the symmetries of the IR active stretching modes of vibration.1. Arrange the following in decreasing order of stretching vibration frequency.A. C = S, C = N, C = C, C=O B. C- H, N-H, O-H C. How many vibrational degrees of freedom does a chloroform (CHCl3) molecule possess? 2. What are some of the factors that can make interpreting IR spectra more difficult and that should be considered to avoid band misinterpretation?
- Which of the following molecules may show a pure rotational microwave absorption spectrum: (i) H2O, (ii) H2O2, (iii) NH3, (iv) N2O?Analyze the important stretching frequencies and functional groups in the following infrared spectroscopyWhich of the following molecules would be expected to have absorbance in the IR range from a symmetric stretching vibration? SO2 CS2 CF4 CO2 CH4
- How many normal modes of vibration are there for (a) NO2 (b) N2O, (c) cyclohexane. (d) hexane?What is the order of infra red stretching frequencies of the given compounds?(in increasing order)In the infrared spectrum of He79Br, there is an intense line at 2559 cm−1 . Calculate the force constant of He^79 Br and the period of vibration of He^79 Br.