ALKENES

Descripción

A2 (M4:S1 - Basic Concepts and Hydrocarbons) Chemistry Mapa Mental sobre ALKENES, creado por Emily Langridge el 08/09/2017.
Emily Langridge
Mapa Mental por Emily Langridge, actualizado hace más de 1 año
Emily Langridge
Creado por Emily Langridge hace alrededor de 7 años
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Resumen del Recurso

ALKENES
  1. definition
    1. unsaturated hydrocarbons (CnH2n)
      1. have at least one C=C double covalent bond
      2. sigma bonds
        1. formed when 2 s orbitals overlap
          1. highest possible e- density between the 2 bonded nuclei
            1. this is a single covalent bond
            2. high e- density means strong electrostatic attraction between nuclei and shared pair of e-s (strongest covalent bond)
              1. high bond enthalpy
            3. pi bonds
              1. formed by the sideways overlap of 2 p orbitals
                1. two parts - 'above'+'below' molecular axis because of dumb-bell shaped p orbitals
                  1. e- density is spread out so weaker electrostatic attraction and low bond enthalpy
                  2. reactivity
                    1. C=C contains sigma and pi bonds so highly reactive
                      1. 4 e- (high density) and pi bond sticks out above and below the rest of the molecule
                        1. means pi bond is likely to be attacked by electrophiles
                      2. low bond enthalpy of pi bond
                        1. means alkenes are good staring points for making other organic compounds and petrochemicals
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