Answer:
Option D
Explanation:
$Cl_{2}$, $Br_{2}$ and $I_{2}$ are homonuclear diatomic molecule in which electronegativity of the combining atoms is same, so they are more stable and less reactive, whereas, I and Cl have different electronegativites and bond between them are polarised and hence, reactive. Therefore, interhalogen compounds are more reactive.
Time Saving Technique.
In this type of question of halogen, only go through the polarity of the molecule. As we know, diatomic molecule does not have polarity but molecules with dissimilar sizes have polarity resulting in more reactivity.
