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The structure of Beryllium chloride () is highly dependent on its physical state and temperature. Whs Block Elements Chemistry Question

Question

The structure of Beryllium chloride ($BeCl_2$) is highly dependent on its physical state and temperature. Which of the following accurately tracks the structure of $BeCl_2$ from solid state $\rightarrow$ vapor phase (< 1200 K) $\rightarrow$ vapor phase (> 1200 K)?

Answer: B

💡 Solution & Explanation

In the solid state, $BeCl_2$ exists as a highly stable, halogen-bridged polymeric chain. When heated into the vapor phase below 1200 K, it breaks down into a chlorobridged dimer ($Be_2Cl_4$). Above 1200 K, it further dissociates into an sp-hybridized linear monomer ($BeCl_2$).

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