The correct order of increasing bond lengths of $C-H$, $O-H$, $C-C$ and $H-H$ is

The bond energies of $F_2, Cl_2, Br_2$ and $I_2$ are $155.4, 243.6, 193.2$ and $151.2 \, kJ \, mol^{-1}$ respectively. The strongest bond is......

The number of electrons in the valence shell of the central atom of a molecule is $8$. The molecule is

Given below are statements about some molecules/ions. Identify the $CORRECT$ statements.
$A$. The dipole moment value of $NF_3$ is higher than that of $NH_3$.
$B$. The dipole moment value of $BeH_2$ is zero.
$C$. The bond order of $O_2^{2-}$ and $F_2$ is same.
$D$. The formal charge on the central oxygen atom of ozone is $-1$.
$E$. In $NO_2$, all the three atoms satisfy the octet rule, hence it is very stable.
Choose the correct answer from the options given below:

Which of the following species contains four lone pairs of electrons?

Which of the following compounds does not exist?