Question

Which one is more stable pcl3 or pcl5 and why ?

Answer 1

PCl3 is more stable than PCl5 because PCl5 has steric crowding(triagonal bipyramidal shape and sp3d2 hybridisation) than PCl3(triagonal planar structure and sp3 hybridisation).

Answer 2

Hey !!

PCl₃ is more stable than PCl₅ because on heating PCl₅ decomposes to form PCl₃ and Cl₂

                  PCl₅ --(Δ)--> PCl₃ + Cl₂

Hope it helps you !!