The article ‘Oxygen, sulfur, selenium, tellurium and polonium’ by L. Myongwon Lee and I. Vargas-Baca (Annu. Rep. Prog. Chem., Sect. A: Inorg. Chem., 2012, 108, 113) summarizes highlights from the 2011 literature on the chemistry of the Group 16 elements. Use the references in this paper to 

(a) Outline the synthetic methods use to prepare [Te₅Mo₁₅O₅₇]⁸⁻, 

(b) Sketch the structure of aryl tellurium monohalides, 

(c) Sketch the structures of AsSCl and AsS₂, 

(d) Describe the products of the reaction of ClP₄S₃ with sulfur.