These are not soluble in water.
An Ionic bond is the bond formed by the complete transfer of valence electron to attain stability.
If the electronegativities of the combining atoms do not differ much then the bond formed between them is likely to be covalent.
In the formation of the oxygen molecule, each oxygen atom has six electrons in their valence shell. Each atom requires two more electrons to complete their octet.
Carbon cannot gain or donate electrons to complete its nearest noble gas configuration.
Think about electrovalent bond.
NaCl is an example of Ionic Bond
The covalent bonded molecules have low melting and boiling point.
Electrovalent compounds are soluble in water.
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