Question

The compound which has a molecular in nature in gas phase but ionic in solid state is:

• A. $PC{l}_5$
• B. $PC{l}_3$
• C. $POC{l}_3$
• D. $NC{l}_3$

Answer 1

The correct option is A $PC{l}_5$

$PC{l}_5$ exist in gas phase, however it remains in solid state in ionic form in the form of $\left[PC{l}_4{]}^{+}\right[PC{l}_6{]}^{-}$. The cation is tetrahedral and anion is octahedral.

$CC{l}_4,PC{l}_{3}andPOC{l}_3$ are liquid at room temperature, with a boiling point below that of water.