Question

the most violent reactions please with chemical equations

Answer 1

Hydrogen peroxide is extremely volatile, with the merest nudge setting off an explosion in laboratory grade solutions (>70% hydrogen peroxide). 
from my point of view this is most violent reaction
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Answer 2

 Burn­ing mag­ne­sium

Mag­ne­sium is a met­al that burns bright­ly in air. If you light a mag­ne­sium strip with­out any mix­tures in it, it will give off a bright and blind­ing flame that is harm­ful to the hu­man eye. Burn­ing mag­ne­sium re­sem­bles a weld­ing op­er­a­tion, be­cause of the large spec­trum of ra­di­a­tion: the sub­stance re­leas­es harsh ul­tra­vi­o­let light. The burn­ing tem­per­a­ture is around 3,000 de­grees Cel­sius.

The chemical equation, Mg + O2 MgO shows this reaction but it needs to be balanced to make 2Mg + O2 2MgO.