Match the elements of Column I to elements of Column II. There can be single or multiple matches. Column I (a) \(\mathrm{S}_{\mathrm{N}} 1\) reaction (b) \(\mathrm{S}_{\mathrm{N}} 2\) reaction (c) El reaction (d) E2 reaction Column II (p) Carbocation (q) \(\mathrm{CH}_{3}-\mathrm{CHCl}-\mathrm{CH}_{2}-\mathrm{CH}_{3}+\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{O}^{-} \stackrel{\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{OH}}{\longrightarrow}\) Major product (r) one step process (s) \(\mathrm{CH}_{3}-\mathrm{CHBr}-\mathrm{CH}_{3}+\mathrm{I}^{-} \stackrel{\text { acetoee }}{\longrightarrow}\) (t) Racemisation

(a) SN1 reaction: A unimolecular nucleophilic substitution reaction, which proceeds in two steps. It involves the formation of a carbocation intermediate and can lead to product racemization. (b) SN2 reaction: A bimolecular nucleophilic substitution reaction, which is a single-step process. (c) E1 reaction: A unimolecular elimination reaction, which involves the formation of a carbocation intermediate and forms a double bond in the product. (d) E2 reaction: A bimolecular elimination reaction, which takes place in a single step forming a double bond in the product.

(a) SN1 reaction: (p) Carbocation - SN1 reaction involves the formation of a carbocation intermediate. (t) Racemisation - SN1 reaction can lead to product racemization. So, (a) corresponds to (p) and (t). (b) SN2 reaction: (r) one step process - SN2 reaction is a single-step process. (s) \(\mathrm{CH}_{3}-\mathrm{CHBr}-\mathrm{CH}_{3}+\mathrm{I}^{-} \stackrel{\text{acetoee}}{\longrightarrow}\) - This represents an SN2 reaction where iodide ion is the nucleophile replacing the bromide ion. So, (b) corresponds to (r) and (s). (c) E1 reaction: (p) Carbocation - E1 reaction involves the formation of a carbocation intermediate. (q) \(\mathrm{CH}_{3}-\mathrm{CHCl}-\mathrm{CH}_{2}-\mathrm{CH}_{3}+\mathrm{C}_{2}\mathrm{H}_{5} \mathrm{O}^{-} \stackrel{\mathrm{C}_{2} \mathrm{H}_{3}\mathrm{OH}}{\longrightarrow}\) Major product - This is an example of an E1 reaction, where ethoxide ion removes a proton from the α-carbon leading to the formation of a double bond. So, (c) corresponds to (p) and (q). (d) E2 reaction: (r) one step process - E2 reaction is a single-step process. So, (d) corresponds to (r). In conclusion, the correct matches are: (a) → (p), (t) (b) → (r), (s) (c) → (p), (q) (d) → (r)