Question

Excess Bond Energy

In developing the concept of electronegativity, Pauling used the term excess bond energy for the difference between the actual bond energy of X-Y and the averagebond energies of X-X and Y-Y. Based on these values,
B=2.0
H=2.1
P=2.1
Se=2.4
C=2.5
S=2.5
Br=2.8
Cl=3.0
Which of the following substances contains bonds with no excess bond energy?
(a) Ph3 (b) CS2 (c) BrCl (d) BH3 (e) Se8

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