Question

why is pcl5 unstable

Answer 1

Answer:

PCl5 is unstable because phosphorus forms 5 bonds with cl atoms out of which the two axial bonds have more Bond length than three equatorial Bond length this result in repulsion and thereby making the axial bonds weak.

therefore PCl5 is unstable

Answer 2

Reason for $PCl_5$ unstable:

• $PCl_5$ contain the 10 electron in its shell.

• It is unstability of $PCl_5$ is due to the presence of axial bonds.

• This axial bond which leads to the formation of the 90 degree with the triangular plane.

• This form the one phosphorous bond and three chloride bond which provide a larger repulsion at the axial position, then the $PCl_3$ dissociate into the $PCl_5$.

• $PCl_5$ indicates the phosphorous pentachloride,, which is used for the chlorination reagent.
• It is a colourless and water sensitive which is contaminated with the hydrogen chloride.

To know more

Which of the two allotropes of phosphorus has a higher density .Explain

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White phosphorus has lower melting point than red phosphorus. Explain

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