Fill in the blanks by choosing appropriate words from the following list :
List : addition, carboydrates ,hydrocarbons,
`C_n H_(2n + 2,)` catenation,, homologus, substitution
(i) Alkanes generally undergo ..... Reactions.
(ii) Compunds containing carbon and hydrogen onhly are called . .....
(iii) The general formula for alkanes is..................
(iv) A family of organic compunds with the same general formula is known as a ...........series.