Question

Which of the following undergoes substitution reaction?

Options

• \[\ce{Ethylene + HCl ->}\]

• \[\ce{Isobutyl alcohol ⇌[H^+]}\]

• \[\ce{Methane + Cl2 ->[UV light]}\]

• \[\ce{Ethyl chloride ->[Alcoholic NaOH][\Delta]}\]

Answer 1

\[\ce{Methane + Cl2 ->[UV light]}\]

Explanation:

In the next response, −Cl takes the place of one of the methane atoms −H atom.

\[\begin{array}{cc}
\phantom{}\ce{H}\phantom{........................}\ce{H}\phantom{.......}\\
\phantom{}|\phantom{.........................}|\phantom{.......}\\
\ce{H-C-H + Cl-Cl ->[UV light] H-C-Cl + HCl}\\
\phantom{}|\phantom{.........................}|\phantom{.......}\\
\phantom{}\ce{\underset{\text{Methane}}{H}}\phantom{................}\ce{\underset{\text{Methyl chloride}}{H}}\phantom{.}
\end{array}\]

In a substitution reaction, an atom or group is directly replaced by another atom or group.