How are interhalogen compounds formed? What general compositions can be assigned to them?

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Interhalogen Compounds

Interhalogen compounds : Halogens react with each other to form a number of compounds called interhalogen compounds, whose general formula is XX'n.

where X = less electronegative atom (have larger size)

         X'= more electronegative atom (have smaller size)

         n =no. of more electronegative atoms

They are of four types :

XX' = ClF, BrF, IF, BrCl, ICl, IBr

XX3' = ClF3, BrF3, IF3, ICl3

XXX5' = CIF5, BrF5,IF5

XX7' = IF7

Naming : The halogen with positive oxidation state named first and with negative oxidation state named after first with suffix 'ide'.

Example : BrCl3Bromine trichloride

IF7Iodine heptafluoride

Preparation of Interhalogen Compounds :

By direct combination :


Cl2+F2equal volumes473K2ClFChlorine monofluoride

Cl2+3F2excess5732ClF3Chlorine trifluoride

I2+7F2523K-573K2IF7Iodine heptafluoride





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