Key Idea Nucleophilic substitution reactions involve substitution (replacement) of a group or atom by a nucleophile. KOH⟶K++OH−RX+ nucleophile OH−⟶R−OH+KX 
Which of the following reactions is an example of nucleophilic substitution reaction?
Held on 30 Apr 2009 · Verified 9 Jul 2026.
RX+KOH⟶ROH+KX
2RX+2Na⟶R−R+2NaX
RX+H2⟶RH+HX
RX+Mg⟶RMgX
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