Q46. Which among the following compounds will undergo fastest $\mathrm { S } _ { \mathrm { N } } 2$ reaction.
(1)\\
\includegraphics[alt={}]{smile-e20d72e5f0dab336c478b8eaa10d66193be21e27}
(2)\\
\includegraphics[alt={}]{smile-b8d023f74b45ec2a7c52e7be90739bfcfead5ec6}
(3)\\
\includegraphics[alt={}]{smile-91b47f5084f71aaedc0edf2871da0bbd35338c9c}
(4)\\
\includegraphics[alt={}]{smile-9ae861614c7cda30014b80f8265ab12b8154ae2d}