複選題
26. Given phosphine-I₂ (Ar₃P-I₂) adducts and the correlations between their P-I and I-I bond lengths are shown below. How many of following statement(s) is/are correct?

 (i) Phosphines forms Lewis acid-base adducts with I₂, in which phosphines are Lewis base and I₂ is Lewis acidic.

 (ii) Generally, stronger phosphine donors result in the Ar₃P-I₂ adduct with shorter I-I bond length. (ili) The I-I bond lengthening is attributed to the donation from phosphine ligands into π* orbitals of I₂.

 (iv) The I-I bond lengths of Ar₃P-I₂ adducts are longer than that of I₂. 

(v) Steric hindrance caused by the ortho-substituents does not influence the magnitude of the P-I and I-I bond lengths.
  
(A) 1
(B) 2
(C) 3
(D) 4
(E) 5