Question

which does not contain coordinate bond-
1. BH4-
2.NH2-
3.CO3^2-
4.H3O+

Answer 1

The carbonate ion, CO₃^2- The carbonate ion is bonded like this: Like the sulphate ion, the negative charges are again found on two of theoxygenatoms. In theLewis structure of CO₃^2-, the C atom in the middle forms one double bond with an O atom and forms two single bonds with the remaining two O atoms. The two single C-O bonds include O atoms that have lone pairs that can form coordinate covalent bonds with atransitionmetal ion. CO₃^2-can then become monodentate by creating one coordinate bond using one oxygen atom's lone pair, or become bidentate by creating two coordinate bonds using both the oxygen atoms with lone pairs. Carbonato cannot form a coordinate covalent bond using the O atom in the double C-O bond because oxygen is most stable when it has two bonding pairs and two non-bonding pairs. That O atom is already in a favorable state and would not likely want to form a coordinate bond. Apply this concept of lewis structure formation for every option and find out whether it forms a co-ordinate bond or not Example of coordinate bond formation is follows Carbon monoxide, CO, can be thought of as having two ordinary covalent bonds between the carbon and the oxygen plus a coordinate bond using a lone pair on the oxygen atom.