How many bonds and pi bonds does glycine have?

[ace123]

[SOLVED] molecular orbital model

I have a few quick questions:

consider the structure of glycine
a) indicate the hybridizations at each N and C atom in the molecule?
I got sp3, sp3, and sp2

I don't have a problem with that question

b) what is the total number of bonds in the molecule? Not quite sure what this means do i just add them up counting the double bond as 2? So any help would be appreciated

c) what is the total number of pi bonds in the molecule? I think it's 1 because the oxygen at the end has 2p orbitals holding just lone pairs

My basic problem is b. and what do I? Any help would be appreciated.

 

[eli64]

Hi,

yes count double bond as 2

1 double bond = 1 pi bond + 1 sigma bond

only 1 double bond so only 1 pi bond (its the C=O) that has the pi bond, not the O in (C-O) at the end.

 

[ace123]

Okay so i looked up the answer for b) and it said 10. How is it 10? Did i draw it wrong or I just can't count? And about c) i thought their was a pi bond between the C and O because they each have an empty p orbital? Or that's wrong b/c the p orbitals on the O are holding lone pairs?

Thanks for answering

 

[ace123]

Um yea ignore the question for b) I actually added wrong

 

[eli64]

a pi bond is the SIDE-BY-SIDE overlap of 2 p orbitals (one from O, one from C) that each have 1 electron in them. These p orbitals are unhybridized.


The orbitals that are holding the lone pairs on O are HYBRIDIZED sp2 orbitals. They are not p orbitals that are empty.

 

[ace123]

but what about the left over p orbital? Like if it's sp2 hydridized there should be a p left right?

 

[ace123]

ahh I am sorry. I was trying to overlap a p orbital twice. Thank You