Among the following molecules, which has atleast three atoms in the same plane?

a. ${\mathrm{CH}}_4$

b. ${\mathrm{BF}}_3$

c. ${\left({\mathrm{CH}}_3\right)}_3\mathrm{N}$                     

The species, which can have all atoms in the same plane is/are:

$\mathrm{a}. {\mathrm{H}}_2{\mathrm{SO}}_4$

$\mathrm{b}. {\mathrm{H}}_2\mathrm{O}$

$\mathrm{c}. {\mathrm{HNO}}_3$

$\mathrm{d}. {\mathrm{CCl}}_4$

In which of the following compounds, all the carbon atoms are in the same hybridized state?

$\mathrm{a}.$ ${\mathrm{C}}_2{\mathrm{H}}_2$

$\mathrm{b}.$ ${\mathrm{C}}_2(\mathrm{CN}{)}_4$

$\mathrm{c}.$ ${\mathrm{C}}_2(\mathrm{CN}{)}_2$

$\mathrm{d}.$ $\mathrm{CH}\equiv \mathrm{C}-\stackrel{\stackrel{\mathrm{O}}{\parallel }}{\mathrm{C}}-\mathrm{OH}$

Which one of the following has the same number of lone pair(s) around the central atom?

$\mathrm{a}$. ${\mathrm{XeF}}_5^{-}$

$\mathrm{b}$. ${\mathrm{XeF}}_4$

$\mathrm{c}$. ${\mathrm{ICl}}_3$

$\mathrm{d}$. ${\mathrm{NH}}_2^{-}$