From up to down: smoke grenade, fragmentation grenade and phosphorus grenade.
The phosphorus grenades ('White Phosphorus', also known as 'Willie Peter'), were 'technically' considered smoke grenades, but in reality they were incendiary grenades and mostly used inside the tunnels, were those grenades were able to burn out all of the oxygen in a very short time, and so killing the enemies by asphyxiation
His flame used to burn at a very high temperature, couldn't be extinguished using water and when it touched the skin, it used to attach at just like napalm did, creating very severe burns and very difficult to treat.
After the Vietnam war, using phosphorus grenades 'near inhabited zones' was declared a war crime, but since such a legal definition is quite ambiguous, nowadays is very rarely used by any army, to avoid controversies.