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| Column-$I$ (Reaction) | Column-$II$ (Mechanism) |
| $(A)$ $OH^- + CH_3Cl \to HOCH_3 + Cl^-$ | $(1)$ $S_N2$ mechanism |
| $(B)$ $(CH_3)_3CBr + OH^- \to (CH_3)_3COH + Br^-$ | $(2)$ $S_E2$ aromatic |
| $(C)$ $CH_3CH_2Br \xrightarrow[ethanol]{KOH} CH_2 = CH_2$ | $(3)$ $S_N1$ mechanism |
| $(D)$ $C_6H_6 + Br_2 \xrightarrow{Fe} C_6H_5Br + HBr$ | $(4)$ $\beta$-elimination (dehydrohalogenation) |
| Column-$A$ | Column-$B$ |
|---|---|
| $(1)$ $CH_3-CH_2-Cl + KOH_{(aq)} \rightarrow$ | $(A)$ $1,2-\text{dichloroethane}$ |
| $(2)$ $CH_3-CH_2-CH_2-CH_3 \xrightarrow{AlCl_3/HCl}$ | $(B)$ $\text{Chloromethane}$ |
| $(3)$ $CH_3-CH_2-Br + \text{alc. } KOH \rightarrow$ | $(C)$ $\text{But-2-ene}$ |
| $(4)$ $CH_2=CH_2 + Cl_2 \rightarrow$ | $(D)$ $\text{Ethanol}$ |
| $(E)$ $\text{Chloroethane}$ | |
| $(F)$ $\text{Ethene}$ | |
| $(G)$ $\text{Isobutane}$ |
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