CHEM 230 Final Exam Questions With Complete Solution

IR Spectra correct answer: -Absorption of radiation causes vibrational excitation of functional groups *making it easy to ID functional groups* *0-5000cm-1* H NMR Spectra correct answer: *0-12ppm* C NMR Spectra correct answer: *0-200ppm* Mass Spec correct answer: -Used to measure the molecular weight (mass) of the compound. Alkyne Reactions correct answer: *1* Alkyne + H2/Pd &C = Alkene *2* Alkyne + H2/Lindlav Cat.= Cis Alkene *3* Alkyne + Li or Na/Liquid NH3= Trans Alkene *4* Alkyne + (HBr/HCL & Br2)= Alkene with X on same C *5* Alkene + H20= Alkene (enol-->ketone) Carbocation General Info. correct answer: -Sp2 hybridization -Empty P orbital -Stereochemistry: Flat and can be attacked on top or bottom *Non-stereoselective* Nucleophile Vs. Electrophile correct answer: *Nucleophile* : -Electron *rich* - *Anion* , lone pair, etc. *Electrophile* : -Electron *deficient* - *Cation* , + side of ion, empty orbitals Stereoselectivity correct answer: - *Stereoselective* (either syn/anti addition) - *Non-Stereoselective* (Differ Intermediates formed/ Racemic Mix) Meso Compound correct answer: -Line of sym. present within compound *Achiral*