Chem 33 kanan stack 2012 ps 2 pg 3 6 degrees of

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Chem 33, Kanan & Stack, 2012 PS 2; pg 3
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6. Degrees of unsaturation . Acyclic alkanes with an empirical formula of C n H 2n+2 are considered to be “fully saturated”. Introduction of a π -bond or ring within the structure increases the degree of unsaturation; a mono-alkene has an empirical formula of C n H 2n as does a mono-cyclic hydrocarbon (e.g. cyclohexane). These complexes are considered to have one degree of unsaturation. Cyclohexene, a cyclic structure containing one double bond, has two degrees of unsaturation and thus a molecular formula of C 6 H 10 (C n H 2n-2 ). = degree of unsaturation n C = # C atoms n N = # N atoms n H = # H atoms 2 n C + n N + 2 n H 2 (b) These principles can be extended to molecules containing heteroatoms in a straightforward manner. The following equation can be readily derived (see JF p. 751): Draw 10 structural isomers of the molecular formula C 3 H 7 N: (a) Structural isomers are compounds that have the same molecular formula, but different atom connectivity. Please read section 2.11 in J&F, which details a strategy to obtain all isomers. Independent verification of all 9 isomers of C 7 H 16 would be good practice before attempting to draw 14 structural isomers of the molecular formula C 5 H 8 . Chem 33, Kanan & Stack, 2012 PS 2; pg 4
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7.Draw resonance structures for the conjugate base (i.e. monoanion) of each acid shown below.
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