Question

The bond angle between two hybrid orbitals is 105o. The percentage of s-character of hybrid orbital is between

Solution

Correct option is

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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Q2

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Q4

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Q5

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Q6

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Q7

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Q8

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Q9

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Q10

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