When the carbon-oxygen bonds in `H_(3)COH,H_(2)CO, and HCO_(2)^(-)` are arranged in order of increasing length, what is the correct order?

Options

A. `H_(3)COH,H_(2)CO,HCO_(2)^(-)`
B. `HCO_(2)^(-),H_(3)COH,H_(2)CO`
C. `H_(2)CO,HCO_(2)^(-),H_(3)COH`
D. `H_(3)COH,HCO_(2)^(-),H_(2)CO`

Answer

C

Explanation

`{:(CH_(3)-O-H,,H-overset(O)overset(||)C-H,,H-overset(O)overset(||)C-H,H-overset(O)overset(||)C-O^(Theta)harrH-overset(" "O^(Theta))overset(|)C=O),(" I"," II"," III"):}`
I has single bond character while II has double bond character and III has partial double bond character, Hence B.L. order : II lt III lt I.