CHEM 2OA3 Lecture Notes - Conformational Isomerism, Hyperconjugation, Halogenation

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If there"s a specific form he"s looking for, he has to specify more details about it, or else you can draw any potential rotamer and it would be correct. Barrier energy is the sum from the lowest point to the highest point. Homolytic cleavage: a:b a" + b (radicals) Heterolytic cleavage: a:b a+ + :b- Use electronegativity to compare acidity: o-h bond is much stronger than a c-h bond, but h2o is more acidic than ch4 because oxygen is more electronegative than carbon. Ch4 bond strength > primary > secondary > tertiary. More stable products when you cleave bond weaker bond: product energy level changes also change the energy barrier to make the break of the bond. Hyperconjugation: p-orbital (with a single electron) overlaps with bonding molecular orbital of neighboring c-h (or any other) bond: should be able to show a 3d drawing of it if asked, more hyperconjugation more stability. Br" + ch4 h-br + ch3 (propagation)