Identify the odd-electron molecules among $NO$,$NO_2$,$CO$,and $CO_2$. Explain why.

Which one of the following bonds has the highest average bond energy $(kcal/mol)$?

Considering ethene molecule,which of the following statements is/are correct?
$I$. $C-C$ bond is formed by overlapping of $sp^2-sp^2$ hybrid orbitals.
$II$. $C-H$ bond is formed by overlapping of $sp^2-s$ orbitals.
$III$. $p\pi-p\pi$ bond is present.
$IV$. $H-C-H$ bond angle is greater than $H-C-C$ bond angle.
$V$. Nodal plane of $\pi$ bond and molecular plane are same.

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

The $P-P-P$ bond angle in $P_4$ and $S-S-S$ bond angle in cyclo $S_8$ molecule are respectively

What is the total number of planes in $CH_4$ that contain the maximum number of atoms?