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(A, B, C, D) All the given reactions are standard chemical transformations for the preparation of haloalkanes.$1$. $R-Cl + NaCN \rightarrow R-CN$ is a

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$R-I + AgF \rightarrow R-F$

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(A, B, C, D) All the given reactions are standard chemical transformations for the preparation of haloalkanes.$1$. $R-Cl + NaCN \rightarrow R-CN$ is a nucleophilic substitution reaction (cyanide displacement).$2$. $R-OH + NaI \xrightarrow{Conc. H_2SO_4} R-I$ is a method to prepare alkyl iodides,though $H_3PO_4$ is preferred over $H_2SO_4$ to avoid oxidation of $I^-$ to $I_2$.$3$. $R-I + AgF \rightarrow R-F$ is the Swarts reaction,used for the synthesis of alkyl fluorides.$4$. $R-OH + SOCl_2 \rightarrow R-Cl + SO_2 + HCl$ is the Darzens process,which is the best method for preparing alkyl chlorides as the by-products are gases.Since all reactions are correctly represented,the question implies identifying all valid reactions.

Identify the reactions that are correctly matched with their major product.

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