Discussion
The INCORRECT statement about Zeise’s salt is
Answer: C
The incorrect statement is All the Pt-Cl bond lengths in Zeise's salt are equal.
Zeise's salt is K[PtCl3(C2H4)]·H2O. The ethylene exerts a strong trans influence, so the Pt-Cl bond trans to it is longer (about 2.34 Å) than the two mutually trans Pt-Cl bonds (about 2.30 Å). The three bonds are not equal.
The other statements are true. Platinum is +2 (three chlorides, neutral ethylene, overall charge -1). A square-planar d8 Pt(II) complex is diamagnetic. Back-donation from Pt d orbitals into ethylene's π* orbital lengthens the C=C bond, to about 1.37 Å against 1.34 Å in free ethylene.
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