Question
- Why is $\mathrm{PCl}_5$ known but $\mathrm{Pl}_5$ is not?
- Red phosphorus is denser than white phosphorus, why?
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Answer
- $'Cl'$ is small in size as compared to $I$, therefore fire $CI$ atoms can be easily accommodated around $‘P\ '$ atom but five bigger $I$ atoms can not be accommodate due to stearic henderace. $P-I$ bond is weaker than $P-Cl$ bond.
- Red phosphorus has polymeric structure and more inter molecular force of attraction as compared to white phosphorus $($monomeric$)$, therefore, it is denser.
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