The molecule of $CO_2$ has a $180^{\circ}$ bond angle. It can be explained on the basis of:

Among the triatomic molecules/ions,$BeCl_2, N_3^{-}, N_2O, NO_2^{+}, O_3, SCl_2, ICl_2^{-}, I_3^{-}$ and $XeF_2$,the total number of linear molecule$(s)$/ion$(s)$ where the hybridization of the central atom does not have contribution from the $d$-orbital$(s)$ is
[Atomic number: $S=16, Cl=17, I=53$ and $Xe=54$ ]

If a molecule $MX_3$ has zero dipole moment,the sigma bonding orbitals used by $M$ are

In ethene,the bond angle$(s)$ is/are

What is the type of chemical covalent bond between the carbon-carbon atoms in $C_2H_4$?

Which one of the following is a planar molecule?