Shits like acid when it gets in your eyes. This is what the Germans made after they first used Chlorine Gas in the Trenches. It was called [i]Hëd und Shöldas[/i] and was used in appliances such as industrial bleach after the war ended.
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Chlorine gas is actually a strong base. Acting as a strong nucleophile chlorine gas will attack organic molecules with nucleophilic attacks. It acts as a base because it holds a negative charge from the excess electron density it holds. Unlike, something like iodine which is large, chlorine is a rather small element and will search for nuclear rich areas of organic molecules to disperse it's excess electron density. It will make a weak covalent bond with another chlorine atom, however, this bond is extremely weak.