Question

Which of the following statements is/are correct regarding inter-halogen compounds of ABX types?

• A. X may be 1,3,5 and 7
• B. A is a more-electronegative halogen than B
• C. $FB{r}_3$ is a stable inter-halogen compound
• D. the structures of $CI{F}_3$ and $I{F}_2$ show deviation from normal structures and could be explained on the basis of VSEPR theory

Answer 1

Answer: (A), (D)

The correct options are
A X may be 1,3,5 and 7
D the structures of $CI{F}_3$ and $I{F}_2$ show deviation from normal structures and could be explained on the basis of VSEPR theory

The halogens react with each other to form interhalogen compounds. The general formula of most interhalogen compounds is $A{X}_n$, where n = 1, 3, 5 or 7, and A is the less electronegative of the two halogens. The compounds which are formed by the union of two different halogens are called inter halogen compounds.

There are never more than two types of halogen in a interhalogen molecule, which are of 4-types.

1. $AX$- type : $ClF,BrF,BrCl,ICl,IBr$
2. $A{X}_3$-type: $Cl{F}_3$, $Br{F}_3$,
3. $A{X}_5$-type: $Cl{F}_5$, $Br{F}_5$, $I{F}_5$,
4. $A{X}_7$-type: $I{F}_7$

$FB{r}_3$ is not known because $F$ is more electronegative than $Br$ which is against the condition for formation of interhalogen compounds.