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Homework question #43

Posted: Mon Nov 20, 2017 9:36 pm
by Ramya Lakkaraju 1B
Can anyone explain the reasoning behind number 43? The question is:
Do you expect the bond angle between 2 hybrid orbitals to increase or decrease as the s-character of the hybrids is increased?

Re: Homework question #43

Posted: Mon Nov 20, 2017 9:43 pm
by Isita Tripathi 2E
You would expect the bond angle to increase.
This is because of the trend in bond angles in these hybrids:
sp - 180
sp2 - 120
sp3 - 109.5

As the number of p orbitals increases, the "p-character" of the hybrids increases, and therefore the "s-character" decreases. So as the s character increases (less p-orbitals), the bond angle also increases.

Re: Homework question #43

Posted: Mon Nov 20, 2017 10:15 pm
by Ramya Natarajan 1D
Can you explain what they mean by "s-character" though? Besides equal electron density, what are the characteristics of a hybridized s bond? Would whether it increases or decreases the bond just depend on the ratio of s:p orbitals?