The shape of [Cu(NH3)4]2+ is squre planar, Cu2+ in this complex is

a. sp3 hybridised

b. dsp2 hybridised

c. sp3d hybridised

d. sp3d2 hybridised

ans. b.

Square planar geometry arises due to dsp2 hybridisation and answer is option b.
Cu2+ ion has the electronic configuration 3d94s04p0 and the electrons are reaaranged to 3d84s04p1 and one 3d, one 4s and two 4p undergo dsp2 hybridization and accept one lone pair of electrons each from 4 ammonia molecules.  

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