The correct order for $O-O$ bond length in the given substances is:
$I.$ $H_2O_2$
$II.$ $O_2$
$III.$ $O_3$

The decreasing order of bond dissociation energies of $C-C$, $C-H$, and $H-H$ bonds is:

The total number of lone pairs of electrons in the given molecule is

Which of the following represents the incorrect order of adjacent bond angles?

Fill in the blanks given below:
$(i)$ The energy required to completely separate one mole of a solid ionic compound into its gaseous constituent ions is called ........... .
$(ii)$ The angle formed between the orbitals containing bonding electrons around the central atom is called ........... .
$(iii)$ The energy required to break one mole of bonds is called ........... .
$(iv)$ The $VSEPR$ theory was proposed by scientists ............ and ........... .

Which of the following statements regarding $BCl_3$ is incorrect?