Question

The bond between which two atoms has the greatest degree of polarity in the following molecule?

Answer 1

Given molecule is propanol which is an alcohol. The oxygen is more electronegative compared to the carbon and hydrogen atoms. Carbon is more electronegative compared to hydrogen. Thus, based on the electronegativities the oxygen hydrogen bond is more polar in the given molecule.

Complete Step By Step Answer:
Electronegativity is defined as the tendency of attraction of a shared pair of electrons towards itself. In the periodic table halogens are the most electronegative elements. Oxygen is an electronegative element less than halogens.
According to Pauling electronegativity scale, the value of electronegativity of oxygen is $3.44$ and hydrogen has $2.20$ and carbon has the electronegativity of $2.55$
If there is more difference in the electronegativity values of atoms, more will be the polarity of the bond, as one atom will attract the electrons from the other atom leads to the polarity or movement of electrons.
The given molecule is propanol which has carbon, oxygen and hydrogen atoms. Out of these three atoms, oxygen has more electronegativity and hydrogen has least electronegativity. From this the oxygen-hydrogen bond is polar.
Thus, the bond between oxygen and hydrogen atoms has the greatest degree of polarity in the given molecule.

Note:
Due to the presence of oxygen and hydrogen bonds in water, water is considered as a high polar solvent. Alcohols are the chemical compounds that consist of oxygen hydrogen bonds known as polar compounds. Due to the presence of $O - H$ bond alcohols will be soluble in water.