The process of burning of a hydrocarbon in the presence of air to give ${\mathrm{CO}}_2, {\mathrm{H}}_2\mathrm{O},$ heat and light is known as . (Decomposition/ combustion)

Which of the following hydrocarbons will give substitution reactions and why?

${\mathrm{CH}}_4, {\mathrm{C}}_3{\mathrm{H}}_6, {\mathrm{C}}_3{\mathrm{H}}_8, {\mathrm{C}}_4{\mathrm{H}}_6, {\mathrm{C}}_5{\mathrm{H}}_{12}, {\mathrm{C}}_5{\mathrm{H}}_{10}$

Which of the following will give addition reactions and why?

${\mathrm{C}}_4{\mathrm{H}}_{10}, {\mathrm{C}}_2{\mathrm{H}}_6, {\mathrm{C}}_2{\mathrm{H}}_4, {\mathrm{CH}}_4, {\mathrm{C}}_3{\mathrm{H}}_8, {\mathrm{C}}_3{\mathrm{H}}_4$