VITEEE 2009 Paper

Paramagnetic nature depends upon the number of unpaired electrons. Higher the number of unpaired electrons, higher the paramagnetic property will be.
Cu2+=[Ar]3d9, no. of unpaired electrons = 1
V2+=[Ar]3d3, no. of unpaired electrons = 3

Cr2+=[Ar]3d4, no. of unpaired electrons = 4
Mn2+=[Ar]3d5, no. of unpaired electrons = 5
Hence, correct order is
Cu2+<V2+<Cr2+<Mn2+