Lecture Notes 9

c h h example 2 p2

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Unformatted text preview: .. ............. ............. GChem I 9.19 – Typeset by FoilTEX – 1 · N ·· ·· O ·· ............. ............. ............. ............. odd-electron species are called radicals and are normally very H reactive . . . . . . . . . . . . . . . . examples: H ............. ............. C · ............. ............. H H . . . . . . . . . . . . . . . . CH3 (methyl radical) H OH (hydroxyl radical) ·· ·O ·· ............. ............. ·· ·· ............. ............. C · ............. ............. H H ·O H If more than one central atom, use most symmetrical skeleton ............. ............. example 1: C2 H4 ethene A = 2 × 4 + 4 × 1 = 12 N = 2 × 8 + 4 × 2 = 24 S = N − A = 24 − 12 = 12 skeleton structure: GChem I – Typeset by FoilTEX – =⇒ 6 bonds – Typeset by FoilTEX – 9.20 H H H C H C C H C H H H place the six bond pairs: H H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . H C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C H ............. ............. ............. ............. ............. ............. ..........
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