How many sigma and pi bonds are present in a molecule of propyne, ${\mathrm{H}}_3\mathrm{CCCH}$?

Deduce the electron-domain geometry of ${\mathrm{CCl}}_4, {\mathrm{NH}}_3$ and ${\mathrm{CS}}_2$.

Deduce the molecular geometry of ${\mathrm{CCl}}_4, {\mathrm{NH}}_3$ and ${\mathrm{CS}}_2$.

Deduce the bond angle in ${\mathrm{CCl}}_4, {\mathrm{NH}}_3$ and ${\mathrm{CS}}_2$.

Deduce the hybridization state of the central atom in ${\mathrm{CCl}}_4, {\mathrm{NH}}_3$ and ${\mathrm{CS}}_2$.

Deduce the molecular polarity of ${\mathrm{CCl}}_4, {\mathrm{NH}}_3$ and ${\mathrm{CS}}_2$.

Deduce the electron-domain geometry of ${\left[{\mathrm{NO}}_3\right]}^{-}, {\left[{\mathrm{SiF}}_6\right]}^{2-}, {\left[{\mathrm{IF}}_4\right]}^{-}$ and ${\mathrm{SCl}}_4$.

Deduce the molecular geometry of ${\left[{\mathrm{NO}}_3\right]}^{-}, {\left[{\mathrm{SiF}}_6\right]}^{2-}, {\left[{\mathrm{IF}}_4\right]}^{-}$ and ${\mathrm{SCl}}_4$.