Which of the following molecules is/are polar?

A)i only
B)ii only
C)iii only
D)iv only
E)ii and v

Question

Which of the following molecules is/are polar?

A)i only 
B)ii only 
C)iii only 
D)iv only 
E)ii and v

Quizplus · Accepted Answer

i) carbon dioxide (CO2) is a linear molecule with two identical polar bonds that are arranged opposite to each other, so the bond polarities cancel out, making the molecule nonpolar. 
ii) water (H2O) is a bent or V-shaped molecule with two polar O-H bonds, and the molecular shape is asymmetrical, resulting in unequal distribution of electrons and making the molecule polar. 
iii) methane (CH4) is a tetrahedral molecule with four identical symmetrical C-H bonds, which are nonpolar, and the molecule has a symmetrical structure, making it nonpolar. 
iv) carbon tetrachloride (CCl4) is a tetrahedral molecule with four identical nonpolar C-Cl bonds, and the molecule is symmetrical, so the bond polarities cancel out, making the molecule nonpolar.
v) ammonia (NH3) is a trigonal pyramidal molecule with three polar N-H bonds, and the molecular shape is asymmetrical, causing the molecule to be polar.

Which of the Following Molecules Is/are Polar