Why PCl 5 is highly unstable why ?
Answers
PCl5 has 10 electrons around P, using 3d orbitals in addition to the usual 3s and 3p.
Unstability of PCl5 is because of presence of two axial bonds which form an angle of 90 deg with the triangular plane consisting of 1 P and 3 Cl atoms. Thus due to greater repulsions at axial positions in PCl5, it dissociates to give PCl3 and Cl2.
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Answer:
>> Phosphorus pentachloride is a pale greenish-yellow solid with the formula PCl5. Phosphorus pentachloride is known to have the salt-like structure in the crystalline state and to be partly dissociated in solution, especially in polar solvents such as nitrobenzene.
>> Chemical Formula: PCl5
>> Molecular Weight/ Molar Mass: 208.24 g/mol
>> Melting Point: 160.5 °C
>> on equatorial P–Cl bond makes two 90° and two 120° bond angles. Because of this PCl5 is unstable.
>> on axial P–Cl bond makes three 90° and one 180° bond angles
>> Structure : Trigonal Bypyramidal.