Question

The V-C distance in V(CO)₆ and [V(CO)₆ ]^- are respectively (in pm) :

(A) 200, 200

(B) 193, 200

(C) 200, 193

(D) 193, 193

Answer 1

The correct option is (C) 200, 193

The V-C distance in V(CO)₆ and [V(CO)₆]^- are respectively (in pm) as 200, 193 respectively.

As the number of carbonyl groups increases, the pπ−dπ back bonding decreases, and thus the bond length decreases. Thus, [V(CO)₆ ]^- will have a lower distance.