複選題26. Given phosphine-I
2 (Ar
3P-I
2) 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
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