CHEM 357 (Qatar) Recitation 2 (Fall 2008)

CHEM 357 (Qatar) Recitation 2 (Fall 2008) - Organic...

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Organic Recitation #2 August 24, 2008 Chemistry 357 - Qatar Organic Chemistry for the Life Sciences Recitation Exercises 1. ( 24 Marks ) Using curved-arrow notation, show how electrons in the left structure move to produce the second resonance structure. For each example, provide the resonance hybrid that reflects the overall bonding picture including partial charges where necessary. In each example, the second resonance structure is a MORE IMPORTANT CONTRIBUTOR to the resonance hybrid structure and thus, the properties of the species. Explain the reason(s) why? a) H C C H O C H H resonance hybrid H C C H O C H H Explanation: b) resonance hybrid C N N H H H C N N H H H Explanation: c) resonance hybrid H C C H O H H C C H O H : : Explanation: d) resonance hybrid C H H O H C H H O H : Explanation:
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2. ( 6 Marks ) Complete all the structures below by first adding all lone pair electrons necessary to account for the formal charge designated. Then use standard curved- arrow notation to indicate the “flow of electrons” necessary to give the products
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CHEM 357 (Qatar) Recitation 2 (Fall 2008) - Organic...

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