The reaction $RCl + NaI \xrightarrow{\text{Acetone}} R-I + NaCl$ is known as:

Consider the following reaction. Which of the following products is not expected to be formed?
$CH_3CH_2CH(Br)CH_3 + HC \equiv C^- Na^+ \rightarrow ?$

Which of the following species is most reactive in $S_{N}2$ reaction?

Which among the following is a feature of $S_N1$ mechanism?

$tert$-Butylbromide reacts with $aq.$ $NaOH$ by $S_N1$ mechanism while $n$-butylbromide reacts by $S_N2$ mechanism. Why?

Dehydrohalogenation of an alkyl halide is