My text says that

Bond energy between P-O , S-O , Cl-O follows the trend P-O < S-O < Cl-O.

But I think it should be a reverse of what's given because more the electronegativity difference more will be the bond energy and lesser the bond length (this what I believed so far before seeing P-O , S-O , Cl-O trend)

Moreover, after searching the web for the values of the same I was unable to find for P-O , S-O , Cl-O, but I found for C-O and N-O and B.E (bond energy) for it follows C-O > N-O ( which follows my resoning)

Then why the order is different for P-O , S-O , Cl-O is it an exception or could it be explained ?

  • $\begingroup$ I'm not sure but I think there's something to do with the bond lengths. For instance, the $\ce{N-N}$ bond in $\ce{N2}$ is shorter than the $\ce{P-P}$ bond in $\ce{P2}$. This is because of the lone-pairs on N atoms repelling each other and the large size of P makes the distribution of charges possible. Similar reasons might be at play in your case working antagonistically to the difference in electronegativity. $\endgroup$ Apr 16 '17 at 13:05

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