Which of the following does not contain coordinate bond?

What are the formal charges on $\mathrm{B}$ and $\mathrm{N}$, respectively in the given structure?

What is the formal charge on $\mathrm{N}$ in;

For hydrazoic acid, which of the following resonating structure will be least stable?

$\underset{\left(\mathrm{I}\right)}{\mathrm{H}-\mathrm{N}={\mathrm{N}}^{+}={\mathrm{N}}^{-}}\leftrightarrow \underset{\left(\mathrm{II}\right)}{\mathrm{H}-{\mathrm{N}}^{+}-{\mathrm{N}}^{+}={\mathrm{N}}^{2-}}\leftrightarrow \underset{\left(\mathrm{III}\right)}{\mathrm{H}-{\mathrm{N}}^{-}-{\mathrm{N}}^{+}\equiv \mathrm{N}}$

Which of the following overlaps is incorrect [assuming $\mathrm{z}-$axis to be the internuclear axis]?

(a) $2{\mathrm{p}}_{\mathrm{y}}+2{\mathrm{p}}_{\mathrm{y}}\to \mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}$

(b) $2{\mathrm{p}}_{\mathrm{z}}+2{\mathrm{p}}_{\mathrm{z}}\to \mathrm{\sigma }2{\mathrm{p}}_{\mathrm{z}}$

(c) $2{\mathrm{p}}_{\mathrm{x}}+2{\mathrm{p}}_{\mathrm{x}}\to \mathrm{\pi }2{\mathrm{p}}_{\mathrm{x}}$

(d) $1\mathrm{s}+2{\mathrm{p}}_{\mathrm{y}}\to \mathrm{\pi }(1\mathrm{s}-2{\mathrm{p}}_{\mathrm{y}})$