examf_1976 - MIT OpenCourseWare http/ocw.mit.edu 5.80...

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MIT OpenCourseWare http://ocw.mit.edu 5.80 Small-Molecule Spectroscopy and Dynamics Fall 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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MASSACHUSETTS INSTITUTE OF TECHNOLOGY Chemistry 5.76 Spring 1976 Final Examination due May 14, 1976 (Late papers will not be accepted) Answer all questions. Each part is worth 10 points, 120 points total. Open book, open notes, no time limit, no collaboration, pocket calculators strongly recommended. Good luck! I never did like the smell of formaldehyde. The formaldehyde molecule is planar and has two equal C–H bond lengths. C O H H A. Determine the point group for H 2 CO and generate the character of the 12 dimensional reducible Cartesian representation. Reduce this representation and list the irreducible representation labels of the 3N 6 vibrational degrees of freedom of H 2 CO. B. Construct reducible representations using various internal coordinate basis functions. Which normal modes are pure stretching, in–plane bending, out–of–plane bending? Do not list modes that involve combinations of bending and stretching motions. C. Suppose we did not know that H 2 CO was planar, but we were certain that the two CH bonds had equal lengths. Describe how you might use a comparison of the Infrared and Raman Vibrational Spectra to distinguish between the planar and nonplanar possibilities. D.
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examf_1976 - MIT OpenCourseWare http/ocw.mit.edu 5.80...

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