Which of the following xenon-oxo compounds may not be obtained by hydrolysis of xenon fluorides?

To solve this question, we need to determine which xenon-oxo compound cannot be obtained through the hydrolysis of xenon fluorides. Xenon fluorides include XeF2, XeF4, and XeF6. Hydrolysis involves reacting these fluorides with water to form various xenon-oxygen compounds. Let's examine the hydrolysis products of each xenon fluoride step by step.

First, consider XeF2. When hydrolyzed, it decomposes to xenon gas, hydrogen fluoride, and oxygen or hydrogen peroxide. The reactions are:

$$ 2XeF_2 + 2H_2O \rightarrow 2Xe + 4HF + O_2 $$

or alternatively,

$$ XeF_2 + 2H_2O \rightarrow Xe + 2HF + H_2O_2 $$

In both cases, no stable xenon-oxo compound is formed. Therefore, hydrolysis of XeF2 does not yield any of the listed oxo compounds.

Next, consider XeF4. It undergoes slow hydrolysis and disproportionation. The reaction is:

$$ 6XeF_4 + 12H_2O \rightarrow 4Xe + 2XeO_3 + 24HF + 3O_2 $$

Here, xenon trioxide (XeO3) is produced as a stable product. Thus, hydrolysis of XeF4 yields XeO3.

Now, consider XeF6, which undergoes hydrolysis in stages:

• Partial hydrolysis produces xenon oxytetrafluoride (XeOF4):

$$ XeF_6 + H_2O \rightarrow XeOF_4 + 2HF $$

• Further hydrolysis of XeOF4 produces xenon dioxide difluoride (XeO2F2):

$$ XeOF_4 + H_2O \rightarrow XeO_2F_2 + 2HF $$

• Complete hydrolysis produces xenon trioxide (XeO3):

$$ XeF_6 + 3H_2O \rightarrow XeO_3 + 6HF $$

Therefore, hydrolysis of XeF6 yields XeOF4, XeO2F2, and XeO3.

Summarizing the compounds obtained by hydrolysis:

• XeO2F2 is obtained from hydrolysis of XeOF4 (which comes from XeF6).
• XeOF4 is obtained from partial hydrolysis of XeF6.
• XeO3 is obtained from hydrolysis of XeF4 or complete hydrolysis of XeF6.

Now, consider xenon tetroxide (XeO4). It is not prepared by hydrolysis of any xenon fluoride. Instead, it is synthesized by treating sodium perxenate (Na4XeO6) with concentrated sulfuric acid:

$$ Na_4XeO_6 + 2H_2SO_4 \rightarrow XeO_4 + 2Na_2SO_4 + 2H_2O $$

No hydrolysis reaction of xenon fluorides produces XeO4.

Therefore, among the options, XeO4 may not be obtained by hydrolysis of xenon fluorides.

Hence, the correct answer is Option D.