Simple Grenades in Only One Command

To get this sytem into any world install this into it http://pastebin.com/XDwuufCb
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Hello PMC today I have for you Simple Grenades in Only One Command
This only one command block creation adds in 4 craftable grenades to your vanilla experience:

Grenade: Throw Iron Bars and TNT onto the ground together to make one Grenade, drop the grenade and it will count down from five before exploding like a creeper

Highly Dangerous Grenade: Throw Obsidian and a TNT Minecart onto the ground together to make one Highly Dangerous Grenade, drop the grenade and it will count down from five before exploding a larger radius than a creeper.

Smoke Grenade: Throw Sand and Gunpowder onto the ground together to make one Smoke Grenade, drop the grenade and it will count down from five before exploding into white smoke particles, at from 5 blocks away the Smoke Grenade's explosion will give all players in its radius slowness and blindness with not particles for 30 seconds, form 2 blocks away the Smoke Grenade's explosion will give all players in its radius slowness II and blindness for 50 seconds.

Frost Grenade: Throw Snow and TNT onto the ground together to make one Frost Grenade, drop the grenade and it will count down from five before exploding into a poof of snow, to players in a 6 block radius it will give them slowness V for 60 seconds, it will give snow golems regeneration X and Health Boost X for 120 seconds each, to slimes it will change their entitydat to NoAI freezing them in place until you kill them, if the slime is a size 2 or up the slimes that spawn after it will have AI, to all other overworld mobs except witches the Frost Grenade will encase all mobs in a 5 block radius in a 3x3x3 cube of packed ice, and finally all water in a 5x5x5 radius if the Frost Grenade will be turned into packed ice.