Draw Curved Arrows Rxns

The tail of the curved arrow is on an electron pair - either a lone pair or a bond but NEVER an atom. The head of the curved arrow is an atom when forming a sigma bond or a sigma bond when forming a pi-bond. Never exceed the octet rule for a 2nd row element, and make sure you're following one of the patterns: nuc attack, loss L.G., H+ X-fer, or rearrangement.