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30. A complex of dihydrogen, such as [Ir(PⁱPr₃)₂Cl₃(H₂)], is a metal compound with H₂ as ligands. Which of the following statements are correct for this dihydrogen complex?
(A) H₂ is a σ-donor.
(B) The H-H bond length of [Ir(PⁱPr₃)₂CI₃.(H₂)] is longer than that of molecular dihydrogen.
(C) This complex is an 18-electron species.
(D) The formal oxidation state of Ir should be +3.
(E) Hz molecule of [Ir(PⁱPr₃)₂Cl₃(H₂)] forms π-bonding interaction with the Ir.