The correct order of increasing `C-O` bond lengths in `CO, CO_3^(2-)` and ` CO_2` is :

Options

A. `CO_3^(2-) gt CO_2 gt CO`
B. `CO_2 gt CO_3^(2-)gt CO`
C. `CO gt CO_3^(2-) gt CO_2`
D. `CO gt CO_2 gt CO_3^(2-)`

Answer

D

Explanation

From V.B. theory, B.O. in CO i.e., `overset(-)C-=overset(+)O` : is 3, that of O=C=O is 2 while that of `CO_3^(2-)` lon is 1.33. Since the bond length increases as the bond order decreases i.e., CO lt `CO_2` lt `CO_3^(2-)`. Thus option (D) is correct.