The bond angle between two hybrid orbitals is 105o. The percentage of s-character of hybrid orbital is between
21 – 23%
s-character ∝ bond angle for 25% s character (as in sp3 hybrid orbital), bond angle is 109.5o, for 33.3% s character (as in sp2 hybrid orbital), bond angle is 120o and for 50% s character (as in sp hybrid orbital), bond angle is 180o.
Similarly, when the bond angle decreases below 109.5o, the s-character will decrease accordingly.
Decreasing in angle = 120o – 109.5o = 10.5o
∴ Decrease in s-character = 33.3 – 25 = 8.3
Actual decrease in bond angle = 109.5o – 105o = 4.5o
∴ Expected decrease in s-character
Thus, the s-character should decrease by about 3.56%, ie, s-character = 25 – 3.56 = 21.44%
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