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CHEMICAL PROPERTIES OF
CHAPTER 04 XII CHEMISTRY
Chemical reactions of chlorine
The chemical reactions of chlorine are of following types:
1. Oxidation reactions
2. Addition reactions
3. Substitution reaction
4. Auto oxidation - reduction reactions
Cl2 is a strong oxidizing agent
Due to high electronegativity it readily gains electrons and
become negatively charged
Cl2 + 2e- → 2Cl-
Cl2 readily oxidizes other metals and nonmetals
Zn + Cl2 → ZnCl2
Cu + Cl2 → CuCl2
2P + 5Cl2 → 2PCl5
H2 + Cl2 → 2HCl
Cl2 directly combines with certain compounds to give
CH2=CH2 + Cl2 → CH2Cl-CH2Cl
CO + Cl2 → COCl2
SO2 + Cl2 → SO2Cl2
Cl2 replaces one or more atoms from other compounds
H2S + Cl2 → 2HCl + S
2KI + Cl2 → 2KCl + I2
CH4 + Cl2 → CH3Cl + HCl
CH3Cl + Cl2 → CH2Cl2 + HCl
Auto Oxidation and Reduction
Cl2 reacts with water to form Hydrochloric acid (HCl) and
Hypochlorous acid (HOCl).
In this reaction Cl2 is oxidized as well as reduced.
o + H2O → H+Cl- + H+O-2Cl+
Such reactions are called auto oxidation reduction reactions
Solution of chlorine in water is a strong oxidizing agent
In this solution HOCl act as oxidising agent due to +1
oxidation state of Cl
Bleaching action of Chlorine is due to same reason. Cl2 forms
HOCl with water which then oxidizes colored compound to
colorless less compound.
Importance of Chlorine
❏ Manufacture of organic solvents such as CCl4 , CHCl3 etc
❏ Manufacture of vinyl chloride which is used in preparation of plastics
❏ Used in preparation of Pesticides such as DDT,
❏ Manufacturing of synthetic rubber
❏ Used as a bleaching agent for cotton, rayon, wood pulp etc.
❏ Used in sterilization of drinking water
❏ Used in layer test for detection of halogens.
Jan. 1, 2021
Sep. 26, 2020
Sep. 7, 2020
Feb. 18, 2019
May. 7, 2018
Chlorine belongs to p-block of periodic table.
Chlorine is a very powerful oxidizing agent.