Question

Which of the following has the least value of dipole moment?
(correct answer +1, wrong answer -0.25)

• A. $CC{l}_4$
• B. $CHC{l}_3$
• C. $C{H}_{3}C{H}_{2}OH$
• D. $C{H}_{3}COC{H}_3$

Answer 1

The correct option is A $CC{l}_4$

The larger the difference in electronegativity, greater will be the dipole moment. Oxygen atom present in $C{H}_{3}COC{H}_3$ and $C{H}_{3}C{H}_{2}OH$ which will lead to higher dipole moment.
Although $C-Cl$ bond in $CC{l}_4$ are polar, their polarity or dipole moment vectors cancels each other due to its tetrahedral shape. Infact, $CC{l}_4$ has zero dipole moment.
Comparing $CHC{l}_3$ with $CC{l}_4$, latter is having low dipole moment then former.