Question

definition for addition and substitution reaction​

Answer 1

A addition reaction occurs when atoms are added to a compound containing a double or triple bond.

The reactions in which one of the atom replaced by other atom are called substitution reactions.

Hope it helps you..

Answer 2

ʜEY MATE ʜEʀE ɪS Uʀ AɴS :-

ADDITION REACTION

Aɴ OʀɢAɴɪC ʀEACTɪOɴ WʜEʀE TWO Oʀ MOʀE MOʟECUʟES COMʙɪɴE TO FOʀM A ʟAʀɢEʀ OɴE  

SUBSTITUTION REACTION

CʜEMɪCAʟ ʀEACTɪOɴS ɪɴ WʜɪCʜ Aɴ ATOM , ɪOɴ , Oʀ ɢʀOUP OF ATOMS Oʀ ɪOɴS ɪɴ A MOʟECUʟE ɪS ʀEPʟACED