Answer
i. $CO_{2}$: Non-polar
ii. $SO_{2}$: Polar
iii. $N_{2}O$: Polar
iv. $SF_{4}$: Polar
Work Step by Step
i. Linear structure with atoms of equal opposite charges.
ii. It is polar due to lone electrons on Oxygen atom.
iii. It is polar due to difference in electronegativities and lone pairs of electrons on Oxygen.
iv. It is polar due to difference in electronegativities.
