Formation of ethylene from acetylene is an example of
Elimination reaction
Addition reaction
Condensation reaction
CH≡ CH + H2 → CH2=CH2
That is called addition reaction.
CH2=CH2 + H2 → CH3-CH3 is an example of:
The reaction R - Br + NaCN → R-CN + NaBr, is an example of
The correct order of nucleophilic-addition elimination reaction is