Presentation Slides on the topic of Interhalogen AX' type.pptx

Explaination of interhalogen type-AX.

1. INTERHALOGENS AX TYPE

2. Introduction Interhalogen AX type are diatomic interhalogens. Interhalogens of this form have physical properties intermediate between those of the two parent halogens . Most combinations of F, Cl, Br and I are known, but not all are stable. Bond : The covalent bond between two atoms has some ionic characters, the less electronegative element , X ,being oxidized and having partial positive charge. Examples: ClF , BrF, BrCl, ICl, IBr

3. Chlorine Monoflouride (ClF ) : Preparation : Chlorine react with fluorine to form chlorine monoflouride. Cl2 + F2 2ClF ii. One molecule of chlorine react with one molecule of chlorine triflouride to form three molecules of chlorine monoflouride. Cl2 + ClF3 3ClF Physical properties: Colorless gas which liquifies to a yellow liquid and solidifies to colorless solid with characteristics odour. Melting point - 156 Boiling point - 100 can flame filter paper.  

4. Chemical properties : It reacts fastly with metals. Fluorination reaction: When selenium react with chlorine monoflouride, selenium tetraflouride and chlorine is formed. Se + 4 ClF → SeF 4  + 2 Cl 2 When tungsten react with chlorine monoflouride, tungsten hexafluoride and chlorine is formed. W + 6 ClF → WF 6  + 3 Cl 2 Chloroflourination reaction : CO + ClF

5. Bromine Monoflouride (BrF): Preparation : Gaseous bromine reacts with F2 at 50 to give BrF. Br2 + F2 2BrF Physical properties: It condenses to dark red liquid which freezes to a yellow crystalline solid. Chemical properties: BrF is reactive and decomposes to BrF3 and BrF5 along with free bromine.  

6. i. 3BrF BrF3 + Br2 ii. 5BrF BrF5 +2Br2 Iodine monoflouride does not exist.

7. Iodine Monochloride (ICl ): Preparation: It is prepared by adding iodine to liquid chlorine and keeping the mixture at 35 for 24 hours. I2 + Cl2 2ICl ii. An aqueous solution of potassium iodide and iodate react with HCl to liberate Cl. KIO3 + 5KI + 6HCl 3I2 + 3H2O + 6KCl KIO3 + 2I2 + 6HCl KCl + 5ICl + 3 H2O  

8. Physical properties: It exists as red transparent crystals which melt to brownish red liquid . The liquid boils at 100 to red Vapour. It has a choking smell . The vapours cause bad burns on skin. Chemical properties: Iodine Monochloride is hydrolyzed in aqueous solution to liberate iodine. 5ICl + 3H20 HIO3 + 2I2 + 5HCl Liquid iodine Monochloride is a good solvent and dissociates as: 2ICl [I]+ + [ICl2]- Heavy alkali metal chlorides dissolve in ICl except LiCl , Nacl to give ionizing salts.  

9. KCl + ICl [ k]+ + [ICl2]- PCl5, SbCl5, SnCl4, AlCl3, etc., react with ICl to ionize acidic solution . ICl + PCl5 [ I ]+ + [PCl6]- HCl reacts with ICl to form a strong acid ,HICl2. HCl + ICl H[ICl2 ]-

10. IODINE MONOBROMIDE (IBr): Preparation: It is obtained by the direct combination of I 2 and Br 2 . I 2 + Br 2 2IBr Physical properties: It is a crystalline solid. It is grey violet in color. Melting point is 42 . Boiling point is 116 .  

11. BROMINE MONOCHLORIDE (BrCl): Preparation: BrCl can be prepared by the reaction in the gas phase or in aqueous hydrochloric acid solution in the laboratory. BrCl is prepared by oxidizing bromide salt in a solution containing hydrochloric acid. KBrO 3 +2KBr + 6HCl 3BrCl + 3KCl + 3H 2 O