Question

11 Explain how IR spectroscopy could be used to following two compounds, by comparing: distinguish between the The C-O Stretch The C-O Bend The Aromatic Region C-H Stretch The two molecules will produce an identical IR spectrum al b) c) d) e) 12 What must take place in order for infrared absorption to occur? a) Electrons must be promoted from their ground state orbital to a higher energy orbital. b) Bending of covalent bonds causing the nuclei of the atoms to become less magnetically shielded. c) The molecule must either gain or lose an electron, forming an ion. d) A change in the dipole moment of the molecule during the stretching process Molecules must react with the potassium bromide in the salt plate, forming a unique degradation product. e) 13 What happens when you try and cool at room temperature a solution of your crude product, but it is too dilute? a) Small crystals will form and only the impurities remain in solution b) Large crystals will form and only the impurities remain in solution c) No crystals will form, and both the solvent and the impurity remain in solution d) Small crystals will form with impurities remaining in them e) None of the above 14 It is important for the can filter and collect the a) Product, impure b) Impurities, pure c) Product, pure d) Impurities and the product, pure e) Impurities and the product, impure to remain in solution upon cooling so that you crystals. 3Ry

Answer 1

Correct answer is :-

11. c) The aromatic region

12. a) Electrons must be promoted from ground state to the higher energy level.\

13. d) Small crystals will form with impurities remaining in them

14. d) Impurities and the product , pure