Question

Substitution reactions may be__________________.

• A. free radical substitution
• B. nucleophilic substitution
• C. electrophilic substitution
• D. all of the above

Answer 1

The correct option is D all of the above

In organic chemistry, we encounter with 3 types of substitution reactions:
Free radical substitution
Example : Halogenation of methane
$C{H}_4+C{l}_2$ (in the presence of sunlight) $\to$ $C{H}_{3}Cl$
Nucleophilic substitution
Example : $S_{N}2$ reaction
$C{H}_{3}Cl+NaOH\to C{H}_{3}OH+NaCl$
Electrophilic substitution
Example : nitration of benzene
$C_6{H}_6+HN{O}_3/H_{2}S{O}_4\to PhN{O}_2$ (nitrobenzene)

Hence option D is correct.