Identify the isostructural pairs from the following species: $NF_3, NO_3^-, BF_3, H_3O^+, HN_3$

Match the following:

List-$I$	List-$II$
$A$. $BF_3$	$II$. Trigonal planar
$B$. $ClF_3$	$III$. $T$-shape
$C$. $NH_3$	$IV$. Trigonal pyramidal
$D$. $NH_4^+$	$I$. Tetrahedral

The correct match is:

Discuss the molecular structure of $BrF_3$ based on the $VSEPR$ theory.

Which of the following is a planar molecule?

What is the value of the $C-O-H$ bond angle in $CH_3OH$ (in $^{\circ}$)?

$A$ molecule with the formula $AX_4Y$ has all its elements from the $p-$block. Element $A$ is the rarest,monoatomic,non$-$radioactive element from its group and has the lowest ionization enthalpy value among $A, X,$ and $Y$. Elements $X$ and $Y$ have the first and second highest electronegativity values,respectively,among all known elements. The shape of the molecule is: