What do you mean by the tetra valency of a carbon atom? Give your answer on the basis of electronic configuration.

Write the molecular formula and IUPAC name of the member of a homologous series of a hydrocarbon having the general formula as ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}-2}$, for the n value 4.

Write the molecular formula and IUPAC name of the member of a homologous series of a hydrocarbon having the general formula as ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}-2}$, for the n value 5.

Write the molecular formula and IUPAC name of the member of a homologous series of a hydrocarbon having the general formula as ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}-2}$, for the n value 6.