Question

Which one of the following statements is not correct regarding interhalogen compounds?

• A. $\text{IF}_7$ and $\text{ClF}_3$ are colourless gases
• B. $\text{BrF}_5$ and $\text{ClF}_5$ are colourless liquids
• C. $\text{ClF}_3$ on hydrolysis gives $\text{HCl}$ and $\text{HOF}$
• D. Except F--F bond, X--X' bond of interhalogens is weaker than X--X bond of halogens

Hint:

General rule:
• Smaller halogen forms halide acid (HF, HCl, etc.)
• Larger halogen forms oxoacid

Answer 1

The Correct Option is C

Concept: This question tests the properties of interhalogen compounds.

Step 1: Hydrolysis of $\text{ClF}_3$.
Correct hydrolysis: \[ \text{ClF}_3 + 2\text{H}_2\text{O} \rightarrow 3\text{HF} + \text{HClO}_2 \] Thus, Option (3) is incorrect.

Step 2: Checking other statements.

• $\text{IF}_7$ and $\text{ClF}_3$ are gases → correct
• $\text{BrF}_5$ and $\text{ClF}_5$ are liquids → correct
• Interhalogen bonds are weaker than halogen bonds → correct