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Question

Why is PCl5 Lewis acid?


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Solution

Lewis Acid:

  • Any species (molecule or ion) that can accept a pair of electrons is referred to as a Lewis acid.
  • .In the valence shell of PCl5 , there is an empty d orbital.

Lewis structure of PCl5.

  • And also high electronegative chlorine atoms attract the electron cloud towards itself and Phosphorus here becomes more electron deficit.
  • Phosphorus in Phosphorous pentachloride PCl5 takes electrons easily from other compounds. As a result, it is classified as a Lewis acid.


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