Question

Which of the following has the least dipole moment ?

• A. NF3
• B. CO2
• C. SO2
• D. NH3

Answer 1

Answer: (B)

CO2

Answer 2

$\mathrm { O } \stackrel { \leftrightarrow } { = } \mathrm { C } = \mathrm { O }$ The values of C=O bond dipoles are same but acting in opposite direction; so cancel out. Thus dipole moment of CO2 is zero.