Question

Which of the following can not undergo $E_2$ reaction?

• A.
• B.
• C.
• D. None of these

Answer 1

The correct option is C

$E_2$ reaction involves a one-step mechanism in which carbon-hydrogen and carbon-halogen bonds break to form a double bond. $E_2$ elimination requires the presence of hydrogen at $\beta$ carbon of the substance.
Option (c) does not have $\beta -H$ and option (a) and (b) has $\beta -H$. Hence, option (c) is the correct answer.