- #1

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## Homework Statement

http://i.imgur.com/HunOeH0.png

## Homework Equations

MO model

## The Attempt at a Solution

as far as i know, number of pi bond is equal to 3 - the "power" of p (the hybridized bond formed)

the answer "4" is only calculated from the 4 elements' bond in part b, so why the central O and C atom is not considered with calculation of pi bond? Thanks!