Question

Which of the following is a substitution reaction?

• A.
• B. $H-\stackrel{H}{\stackrel{|}{C}}=\stackrel{H}{\stackrel{|}{C}}-H+B{r}_2\to \underset{Br}{\underset{|}{C}}{H}_2-\underset{Br}{\underset{|}{C}}H-H$
• C. $R_2-\stackrel{H}{\stackrel{|}{C}}-Cl\to R_{2}C:$
• D. None of these

Answer 1

The correct option is A

As the name suggests,

The replacement of an atom or group from a molecule by a different atom or group is called as substitution reaction.

e.g.$RX+NaOH\left(aq\right)\to ROH+NaX$

$C_6{H}_6+RX\stackrel{AlC{l}_3}{⟶}{C}_6{H}_{5}R+HCl$


This is example electrophilic aromatic substitution.