Fate:
To state the obvious, in reality we really don't know the effect of plasma rounds on modern munitions, as they don't exist yet.
Well, actually we do know what plasma can do.
https://en.wikipedia.org/wiki/Plasma_(physics)
Fate:
They are listed with having the sur effect, which is basically an EMP effect in addition to burning damage. Combined with an extreme heat shock wave, I would think they have every chance of providing both the heat and the shock wave required to set of any explosives.
No.
Modern explosives are specifically designed to avoid being detonated by exactly this sort of thing. Also, heat is not a factor in setting off an explosion in most cases, certainly not in military explosives - they will only burn, slowly, much like a piece of wood or plastic.
Detonators are another matter - they need to be unstable. The main (Tertiary) charge on the other hand, which forms about 99%+ of the mass of a munition simply won't go off. You need a burn rate of between 3,000 and 9,000 metres per second (depending on the explosive). The fastest bullet has a muzzle velocity of only around 3,000 m/s (and drops off fairly quickly due to drag and other factors). Basically, the speeds required result in a shattering effect (how high explosives are classified) rather than pushing effect (low explosives like propane and gunpowder). Any projectile (solid or gaseous) travelling at those sorts of speeds is likely to break up on firing (or accelerate so slowly as to be useless as a weapon).