Draw a three-dimensional structure of methane molecule. Give the structural formula of the next two higher homologues of methane.

Which of the following compounds are alkanes?

${\mathrm{C}}_2{\mathrm{H}}_4, {\mathrm{C}}_3{\mathrm{H}}_4, {\mathrm{C}}_4{\mathrm{H}}_8, {\mathrm{C}}_5{\mathrm{H}}_{12}, {\mathrm{C}}_5{\mathrm{H}}_8, {\mathrm{C}}_3{\mathrm{H}}_8, {\mathrm{C}}_6{\mathrm{H}}_6$.

Write the IUPAC name for 

Write the IUPAC name of