
| Column $I$ | Column $II$ |
| $(A)$ $Image$ | $(p)$ Racemic mixture |
| $(B)$ $Image$ | $(q)$ Addition reaction |
| $(C)$ $Image$ | $(r)$ Substitution reaction |
| $(D)$ $Image$ | $(s)$ Coupling reaction |
| $(t)$ Carbocation intermediate |


$CH_3CH_2Cl \xrightarrow{NaCN}(i)\xrightarrow{Ni/{{H}_{2}}}(ii)\xrightarrow{acetic\,anhydride}(iii)$ , Product $(iii)$ is