Q4 / 150 · MHT CET 2025 (23 Apr Shift 2) · Chemistry

Which of the following interhalogen compounds in liquid state at room temperature?

  • A
    ICl
  • B
    $\mathrm{ClF}_3$
  • Correct answer
    C
    $\mathrm{BrF}_5$
  • D
    $\mathrm{IF}_7$

Solution

Liquid interhalogen compounds at room temperature (20–25°C) are identified by comparing their phase transition temperatures:

$\text{ICl}$ exists as a red-brown liquid, with the beta form melting at $13.9°\text{C}$ and boiling at $97°\text{C}$.

$\text{BrF}_5$ melts at $-60°\text{C}$ and boils at $40.3°\text{C}$, remaining liquid within the room temperature range.

$\text{ClF}_3$ boils at $11.75°\text{C}$ and $\text{IF}_7$ sublimes at $4.77°\text{C}$, both being gaseous under these conditions.

Thus, only $\text{ICl}$ and $\text{BrF}_5$ are liquids at room temperature.

$\boxed{\text{A, C}}$

Hence, the correct answer is option: 'C'.

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