http://www.rutchem.rutgers.edu/discus/messages/26/311E7GC_question_diagram-1329.

Question

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Provided are the IRspectrum of a reactant and an IR spectrum of a product.To answerthe following questions use IR absorptions. Also use the followingIR absorptions: alkane C-H 2840-3000 cm-1, alkene C-H3050-3150 cm-1

Whatmajor absorption band (provide the bond identity and wavenumber)disappears and what major absorption band (provide the bondidentity and wavenumber) appears going from starting material toproduct to indicate the reaction occurred?

Explanation / Answer

We Know that :       The I.R Spectrum of theReactant reveals that it has a double bond in the molecule We knowthat           C= C str. - 1640 cm-1            = C- H  str. - 3100cm-1       From the I.R Spectrum of theProduct it is clear that the molecule has OH group introduced inthe molecule because of      the absorption at 3350cm-1 The alcohol obtained in the product must besecondary alcohol as the absorption at       1150 cm-1 indicates the C- O absorption in 20 alcohols.            = C- H  str. - 3100cm-1       From the I.R Spectrum of theProduct it is clear that the molecule has OH group introduced inthe molecule because of      the absorption at 3350cm-1 The alcohol obtained in the product must besecondary alcohol as the absorption at       1150 cm-1 indicates the C- O absorption in 20 alcohols.

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