Question

in which molecules coordinet bond is not present ?​

Answer 1

Answer:

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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.

Answer 2

Answer:

In the above structure we can see that among the hydronium ion /H3O+ , ammonium ion / NH4+ , aluminium chloride / Al2Cl6 and hydrazine / N2H6, only hydrazine do not have dative bond.