Mechanism involved in the above two reactions is
I - Nucleophilic substitution ; II- Nucleophilic Substitution
I - Nucleophilic substitution ; II- Electrophilic Substitution
I - Electrophilic substitution ; II- Electrophilic Substitution
I - Electrophilic substitution; II- Nucleophilic Substitution
I…….. Cl– is replaced by OH–…Nucleophilic substitution
II – H+ is replaced by Cl+…. Electrophilic substitution