Answer: Option (d) is the correct answer.
Explanation:
Polarity in a molecule arises due to unequal sharing of electrons. More is the difference in number of sharing of electrons more will be the polarity of a molecule.
In a [tex]CO_{2}[/tex] molecule there is a linear geometry and two oxygen atoms equally pull the valence electrons from carbon atom. So, it means [tex]CO_{2}[/tex] is a non-polar molecule.
In [tex]CH_{4}[/tex], there will be equal sharing of valence electrons between both carbon and hydrogen atoms. Also, bond dipoles will equally cancel out each other. Hence, methane is also non-polar in nature.
[tex]CBr_{4}[/tex] is a symmetrical molecule and its bond dipoles will be cancelled out. Hence, it is also non-polar in nature.
In [tex]CHBr_{3}[/tex], the C-Br bond is polar in nature and this molecule is unsymmetrical in nature. Hence, this molecule will be polar in nature.
Thus, we can conclude that out of the given options [tex]CHBr_{3}[/tex] molecule is polar.
