Explain why $O=C=O$ is non-polar while $R-O-R$ is polar?

(N/A) This can be explained by molecular geometry.
The $CO_2$ molecule is linear,which results in the two $C=O$ bond dipoles being equal in magnitude and oriented in exactly opposite directions.
Consequently,they cancel each other out,leading to a net dipole moment of $\mu = 0$,making the molecule non-polar.
In contrast,the $R-O-R$ (ether) molecule has a bent or angular geometry due to the presence of two lone pairs on the oxygen atom.
As a result,the bond moments do not cancel each other,and the molecule possesses a net dipole moment $(\mu > 0)$,making it polar.