Polarity

In Nitroglycerin, there are four bonds. There is Oxygen to Nitrogen, Oxygen to Carbon, Carbon to Hydrogen, and Carbon to Carbon. Also, Nitroglycerin is a polar molecule because of the uneven distribution of electrons, thus an unstable charge.

Oxygen to Nitrogen
Electronegativity Value for O: 3.5
Electronegativity Value for N: 3.0
Difference: .5 - Very Covalent

Oxygen to Carbon
Electronegativity Value for 0: 3.5
Electronegativity Value for C: 2.5
Difference: 1.0 - Moderately Covalent

Carbon to Hydrogen
Electronegativity Value for C: 2.5
Electronegativity Value for H: 2.2
Difference: .3 - Very Covalent

Carbon to Carbon
Electronegativity Value for C: 2.5
Electronegativity Value for C: 2.5
Difference: 0 - Absolutely Covalent