Explanation:

Sulphur Mustard-When people     come in contact with the vapour,it    causes, blistering of skin and mucous     membrane on contact . Direct exposure     can result in scarring respiratory     problem and even death from     pneumonia.
    Sarin: 20 times deadly as cyanide is a     powerful neutro toxin, its nearly     impossible to detect because of clean     colorless ,tasteless liquid has no odour     recently it has been used in Syria.
    VX- Another neutrotoxin is the worlds    most potent chemical warfare agent 10     times more toxic than sarin.