They are the interhalogen compounds. Let us start with what interhalogen compounds are. Chemistry > The p-Block Elements > Interhalogen Compounds. Interhalogen Compounds- Learn about the preparation of interhalogen Start loving chemistry by getting in touch with BYJU’S through the mobile app. Structural chemistry of the interhalogen compounds. Elizabeth Fessenden. J. Chem. Educ., , 28 (12), p DOI: /edp Publication Date: .

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To name an Interhalogen compound, the less electronegative element is placed on to the left in formulae and naming is done straight forward.

Iodine trichloride ICl 3 forms commpounds yellow crystals which can be melted under pressure to a brown liquid. Why is it impossible for hydrogen to be the central atom? As the ratio of the radius of larger and smaller halogen increases, the number of atoms in a molecule also increases. However, its molecular properties have been determined by spectroscopy: In chlorine trifluoride, chlorine, the central atom has seven electrons in the valence shell.

It reacts with many metal chlorides to form tetrachloriodides, and hydrolyses in water. The interhalogen compounds of type AX and AX 3 are formed between the halogen having very low electronegative difference e. It is physically compounde, but reacts violently with water and most metals and nonmetals.

BrF 5 is too reactive to generate fluorine. Handling concerns, however, prevented its use.

Interhalogens – Chemistry LibreTexts

The interhalogens of form XY have physical properties intermediate between those of the two parent halogens. Most of the interhalogens composed of lighter halogens are fairly colorless, but the interhalogens containing heavier halogens are deeper in color due to their higher molecular weight.


All these compounds are covalent in nature because of less electronegativity distinction between bonded molecules. The molecule has the form of a tetragonal pyramid. Reaction of inter halogens are similar to halogens.

If interhalogens are exposed to water, they convert to halide and oxyhalide ions. These molecules are formed due to the direct combination or by the action of a group 17 element with a lower interhalogen compound under specific conditions.


All interhalogens are diamagnetic. The interhalogens of form XY have physical properties intermediate between those of the two parent halogens. Iodine pentafluoride IF 5 is compoudns Colorless liquid, made by reacting iodine pentoxide with fluorine, or iodine with silver fluoride. What’s more, as it has 7 valence electrons, it can just frame one bond.

It reacts with many metals and metal oxides to form similar ionised entities; with some others it forms the metal fluoride plus free intergalogen and oxygen.

All combinations of fluorine, chlorine, bromine, and iodine that have the above-mentioned general formula are known, but not all are stable. It is, of course, extremely toxic, but that’s the least of the problem. Phosphine Phosphine Table of Content Occurrence and The central atom in Iodine pentafluoride has one lone pair and five bond pairs which compunds why its shape is square pyramidal. ClF 3 is the most reactive of the XY 3 interhalogens.


Interhalogen Compounds | Preparation Of Interhalogen Compounds

iinterhalogen They are all prepared by direct combination of the elements although since in some cases more than one product is possible the conditions may vary by altering the temperature and relative proportions.

Hydrolysis of interhalogen compounds give oxy acid and halogen acid. Thus its shape is bowed T-shape. Fluorine reacts with iodine pentafluoride at K to shape Iodine Heptafluoride. Register and Get connected with our counsellors.

Interhalogen Compounds are the subordinates of halogens. Chlorine monofluoride, chlorine, and tetrafluorosilane were formed.

Interhalogens with one or three halogens bonded to a central atom are formed by two elements whose electronegativities are not far apart. Interhalogen are all prone to hydrolysis and ionize to give rise to polyatomic ions. Chemistry of the Elements 2nd ed. Some properties of interhalogen compounds are listed below.

Tetra-atomic Interhalogens AX 3 Chlorine trifluoride ClF 3 is a colorless gas which condenses to a green liquid, and freezes to a white solid. Some compounds partially ionize in solution. ICl 3 is the least reactive. It reacts with elements, oxides and carbon halides. Most interhalogens chemistru halogen fluorides, and all but three IBr, AtBr, and AtI of the remainder are halogen chlorides.

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