Practice_Exam 3

Practice_Exam 3 - Organic Chemistry CHE230-001 EXAM1 key...

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Organic Chemistry CHE230-001 EXAM1 key Page 1 of 2 1 . ( 15 pts ) Draw line structures (as the lowest-energy resonance structures) for the following compounds. Include all lone pairs and indicate all formal charges (unless the formal charge is zero). Indication regarding how to connect the atoms is present in the molecular formulas given below at left. 1a . S(CH 3 ) 3 + 1b . OCHCHCH 2 (-) 1c . CH 3 NO 2 2a . (5 pts) Compute the degrees of unsaturation in C 2 H 4 O; show you work. My answer for 2c: __DU = 2-4/2+1 ______ 2bc (10 pts) Draw two isomers possessing molecular formula C 2 H 4 O. 3 . (10 pts) Think about the electron-based mechanism of molecular absorption of light. Question: Which should absorb light of lowest energy, saturated or unsaturated hydrocarbons and why? My answer: One or two sentences ! No credit without an explanation. ___________________ __ Unsaturated hydrocarbons absorb lower energy light because the filled bonding and the empty antibonding orbitals are closer in energy than in saturated molecules because pi bonds overlap less efficiently than sigma .
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Practice_Exam 3 - Organic Chemistry CHE230-001 EXAM1 key...

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