To calculate how polar a bond is we can look at the difference in electronegativity. An electronegativity greater than 1.7 represents an ionic bond, a bond less than 1.7 will be a covalent bond.
Let's see wich is the wich is the electronegativity of each element:
C=2.55
O=3.44
N=3.04
The difference of electronegativity of each pair of bonds will be:
Polar bonds are covalent bonds that have a difference in electronegativities. The greater the difference in electronegativity, the greater the polarity.
So, in this case, C-O bond will be more polar that C-N bond, the polarity.
The direction of the polarity will go towards the more electronegative element. So, we will have:
Answer: The most polar bond will be the C-O bond and the direction of polarity will be toward oxygen for the C-O bond and toward nitrogen for the C-N bond.