What is the total number of sigma and pi bonds in the following molecule?

 ${\mathrm{C}}_2{\mathrm{H}}_2$ 

What is the total number of sigma and pi bonds in the following molecule?

${\mathrm{C}}_2{\mathrm{H}}_4$

Considering $\mathrm{x}$-axis as the internuclear axis, which out of the following will not form a sigma bond and why?

(a) $1\mathrm{s}$ and $1\mathrm{s}$ (b) $1\mathrm{s} \mathrm{and} 2{\mathrm{p}}_{\mathrm{x}}$ (c) $2{\mathrm{p}}_{\mathrm{y}} \mathrm{and} 2{\mathrm{p}}_{\mathrm{y}}$ (d) $1\mathrm{s} \mathrm{and} 2\mathrm{s}$.

Which hybrid orbitals are used by carbon atoms in the following molecule? 

$\mathrm{C}{\mathrm{H}}_3–\mathrm{C}{\mathrm{H}}_3$

Which hybrid orbitals are used by carbon atoms in the following molecule? 

${\mathrm{CH}}_3-\mathrm{CH}={\mathrm{CH}}_2$

Which hybrid orbitals are used by carbon atoms in the following molecule? 

${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{OH}$

Which hybrid orbitals are used by carbon atoms in the following molecule?

${\mathrm{CH}}_3-\mathrm{CHO}$

Which hybrid orbitals are used by carbon atoms in the following molecule? 

${\mathrm{CH}}_3\mathrm{COOH}$