Which of the following species contains an equal number of $\sigma -$ and $\pi -$ bonds?

Consider the following statements:
$A$. $NF_3$ molecule has a trigonal planar structure.
$B$. Bond length of $N_2$ is shorter than $O_2$.
$C$. Isoelectronic molecules or ions have identical bond order.
$D$. Dipole moment of $H_2S$ is higher than that of water molecule.
Choose the correct answer from the options below:

Which of the following consists of an equal number of $p\pi - p\pi$ and $p\pi - d\pi$ bonds?

Which of the following sets are correctly matched?

Molecule	Hybridization	Geometry
$I$. $BrF_5$	$sp^3d^2$	Square pyramidal
$II$. $XeF_6$	$sp^3d^3$	Distorted octahedral
$III$. $SF_4$	$dsp^2$	Square planar
$IV$. $PbCl_2$	$sp$	Linear

The correct order of strength of $\pi-$ bond$(s)$ is:
$I$. $BO_3^{-3} < CO_3^{-2} < NO_3^{-}$
$II$. $ClO_4^{-} > SO_4^{-2} > PO_4^{-3}$
$III$. $BF_3 > BCl_3 > BBr_3$
$IV$. $AlCl_3 < BCl_3$

Which of the following sets is not isoelectronic?