Chemistry Question on Chemical bonding and molecular structure

Question

Which of the following molecules has the maximum dipole moment?

Answer 1

Solution

$CO _{2}$ and $CH _{4}$ have a zero dipole moment because of the symmetric structure & among
$NH _{3}$ and $NF _{3}, N$ is more electronegative than $H$ and dipole moment in in the direction of the lone pair, hence $NH _{3}$ has more dipole moment than $NF _{3}$ .