CHEMISTRY TEXTBOOK

Use your brain power
In the above special reaction
for ICl, identify the oxidant and
reductant. Denote oxidation states of
the species.

Do you know?

ICl in liquid state, undergoes

autoionization like water, to form

a cation and an anion.

2 ICl I⊕ + ICl 2

(solvent cation) (solvent anion)

Methods of Preparation of Interhalogen compounds

Method XX’ XX’ 3

1.Direct combination Both in equal volumes

Cl 2 +F 2 Cu-vessel523 K 2ClF

I 2 + Cl 2 HCl + HNOboil^3 2ICl

Br 2 +Cl 2 2BrCl

Cl 2 +3F 2 (excess) 2ClF 3

Br 2 +3F 2 2BrF 3

I 2 +3Cl 2 (excess) 2ICl 3

2.Reaction of halogen with

interhalogen compounds.

Br 2 + BrF 3 3BrF Br 2 + ClF 3 2BrF 3 + BrCl

Special reaction for ICl I 2 +KClO 3 ∆ ICl+KIO 3 -------

Some Properties of Interhalogen compounds

Reaction/Property XX’ XX’ 3

1 Thermal stability ClF > ICl > IBr > BrCl > BrF

2 Hydrolysis gives

oxoacids

BrCl+H 2 O HOBr+HCl

5ICl+3H 2 O HIO 3 +5HCl+2I 2

2ICl 3 +3H 2 O

HIO 3 +5HCl+ICl

3 Disproportionation/

Autoionisation

5BrF 2Br 2 + BrF 5 2ClF 3 ClF 2 ⊕+ClF 4

ICl 3 341 K ICl + Cl 2

4 Flourination --------- U+ClF 3 UF 6 (l)+ClF(g)

5 Addition across

olefins (^) C (^) C
H H
I Cl
H 2 C = CH 2 + ICl H H
Uses of interhalogen compound
XX' XX' 3
ICl is used to determine iodine value of
oils
For Preparation of polyhalides
As catalyst for oxidation of As(III) As fluorinating agent
For Preparation of polyhalides As nonaqueous solvent