types of mechanisms for halogenoalkanes

• Sn1 reactions only have 1 molecule or ion in the rate determining step
• Sn2 has 2 molecules or ions or both in the rate determining step
• primary halogenoalkanes react via Sn2 mechanism
• 2 types of nucleophilic substitution

  Sn1

  Sn2
• secondary halogenoalkanes react via Sn1 or Sn2
• tertiary halogenoalkanes react via Sn1