Covalent bonding is the sharing of electrons between atoms. The electronegativity difference of 1.7 is the largest for a bond to be covalent. Thus, option B is accurate.
The electronegativity difference is the parameter used to determine the polarity and the type of the bond formed by the atom of the species. it gives the measure of the atom to attract the shared electrons.
For a covalent bond to form the electronegativity difference between the two atoms of the molecules must be less than 2. A difference of more than 2 results in ionic bond formation.
Therefore, option B. 1.7 is the highest electronegativity difference for a covalent bond formation.
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