The correct order of increasig `C-O` bond length of `CO, CO_(3)^(2-), CO_(2)` is

Options

A. `CO_(3)^(2-) lt CO_(2) lt CO`
B. `CO lt CO_(3)^(2-) lt CO_(2)`
C. `CO_(2) lt CO_(3)^(2-) lt CO`
D. `CO lt CO_(2) lt CO_(3)^(2-)`

Answer

D

Explanation

Structure of `CO_(2),CO` and `CO_(3)^(2-)` are
`: O=C=O, C-=O:, {:(" ".^(-)O),(" \"),(" "C=O),(" /"),(" ".^(-)O):}`
Bond multiplicity decreases the bond length. Thus CO with a triple bond will have shortest C-O larger C-O bond length . `CO_(3)^(2-)` is resonance hybrid of three structure with a C-O length of more than a C-O double bond but less than a C-O single bond. Thus C-O bond length is maximum in `CO_(3)^(2-)`