5.0 Nature of $C- X$ bond

  Alkyl Halides and Aryl Halides

• Since halogens are more electronegative than carbon, they pull the shared pair of electrons towards themselves, inducing a partial positive charge on carbon and a partial negative charge on the halogen. Thus, the $C-X$ bond in haloalkanes is a polar bond.
  
  
  

• As the size of the halogen atom increases, the carbon-halogen bond length increases but the enthalpy decreases.