(a) The reaction between BiCl₃ and 3 equivalents of EtMgCl yields compound X as the organo product. Two equivalents of BiI₃ react with 1 equivalent of X to produce 3 equivalents of compound Y. In the solid state, Y has a polymeric structure consisting of chains in which each Bi centre is in a square-based pyramidal environment. Suggest identities for X and Y, and draw possible structures for part of a chain in crystalline Y.

(b) The reaction between TeCl₄ and 4 equivalents of LiC₆H₄-4-CF₃ (LiAr) in Et₂O leads to Ar₆Te, Ar₃TeCl and Ar₂Te as the isolated products. Suggest a pathway by which the reaction may take place that accounts for the products.

(c) The reaction of R'SbCl₂ with RLi (R=2-Me₂NCH₂C₆H₄, R'=CH(SiMe₃)₂) leads to RR'SbCl. In the solid state, RR'SbCl has a molecular structure in which the Sb centre is 4-coordinate; RR'SbCl is chiral. Suggest a structure for RR'SbCl and draw structures of the two enantiomers.