Step 1: Recall the properties
Interhalogen compounds are covalent, volatile solids or liquids. They are not explosive, though they are reactive. They add across C=C bonds of unsaturated hydrocarbons.
Step 2: Find the odd one out
They are strong oxidising agents because the halogen in the positive oxidation state readily takes electrons. So (D) is not a characteristic.
Final Answer:
They are strong oxidising agents, so option (D) is not a characteristic.
\[ \boxed{\text{(D)}} \]