Chemistry · p-Block Elements

Which of the following statements are correct with respect to interhalogen compounds? i. Halogens react with each other to form interhalogen compounds. ii. There are never more than two different halogens in a single molecule. iii. Their bonds are essentially covalent, and their melting and boiling points increase as the electronegativity difference between the component halogens increases. iv. Interhalogens are generally more reactive than diatomic halogens (except fluorine, F2).