The molecule below is acrolein, the starting material for...

The molecule below is acrolein, the starting material for certain plastics.
acrolein
(a) Which bonds in the molecule are polar and which are nonpolar?
(b) Which is the most polar bond in the molecule? Which atom is the partial negative end of this bond?

Key Concepts

Identifying the Most Polar Bond

Determining the most polar bond in a molecule involves comparing the electronegativity differences of all bonds present. The bond with the highest difference in electronegativity will be the most polar, and, consequently, the atom with the higher electronegativity in that bond will carry the greater partial negative charge.

Partial Charges

Partial charges occur in polar bonds where due to the difference in electronegativity, the more electronegative atom acquires a partial negative charge (?–) while the less electronegative atom acquires a partial positive charge (?+). These partial charges contribute to the overall dipole moment of the molecule.

Electronegativity Differences

Electronegativity is a measure of an atom’s ability to attract and hold onto electrons in a bond. Significant differences in electronegativity between two bonded atoms lead to polar bonds because the electrons spend more time around the more electronegative atom. The greater the difference, the more polar, or more unevenly distributed, the electron cloud becomes.

Bond Polarity

Bond polarity refers to the uneven distribution of electron density between two atoms in a chemical bond, usually resulting from differences in their electronegativities. In a polar bond, one atom attracts the shared electrons more strongly, leading to a partial negative charge on that atom and a corresponding partial positive charge on the other atom. In contrast, a nonpolar bond occurs when the electron density is shared equally between the atoms, typically because they have similar or identical electronegativities.

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