Which of the following is the correct order of increasing $O-O$ bond length in the given compounds?

The ratio of $\sigma$-bond and $\pi$-bond in tetracyanoethylene is

What is the formal charge on the $N$ atom in the $NH_4^{+}$ ion?

Identify the correct orders against the property mentioned:
$(A)$ $H_2O > NH_3 > CHCl_3$ - dipole moment
$(B)$ $XeF_4 > XeO_3 > XeF_2$ - number of lone pairs on central atom
$(C)$ $O-H > C-H > N-O$ - bond length
$(D)$ $N_2 > O_2 > H_2$ - bond enthalpy
Choose the correct answer from the options given below:

Which of the following pairs are isoelectronic?

The single,double and triple bond lengths of carbon in carbon dioxide are respectively