4. Which metal hydride, in each of the following pairs of compounds, should be more acidic?
(a) HV(CO)6 or (b) HV(CO)3(PPh3)3
(c) HRh(CO)(PPh3)2 or (d) HRh(CO)2{P(OPh)3}

(A)(a) and (c)

(B)(a) and (d)

(C)(b) and (c)

(D)(b) and (d)

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