The shape of the ethylene molecule is

In which of the following compounds does the $C$ atom use $sp^3$ hybrid orbitals for bonding?

The hybridisation of $C$ in diamond,graphite and ethyne is in the order

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 $Xe=54$ ]

Match the following ions with the corresponding hybridisation of their central atoms.

$A. NO_3^-$	$1. sp^3$
$B. NH_2^-$	$2. sp$
$C. SCN^-$	$3. sp^3d$
$D. ICl_2^-$	$4. sp^2$

Which of the $C - C$ bond is strongest?