Identify the appropriate reagent for the following chemical transformation:

Step-by-step solution

The given reaction is a nucleophilic substitution where the hydroxyl group ( -OH ) of an alcohol is replaced by a chloride ion ( -Cl ) to form an alkyl chloride and water ( H₂O ). Evaluating the given options: NaCl: Cannot substitute the -OH group directly because hydroxide ( -OH^- ) is a poor leaving group. Cl₂ : Does not react with alcohols to form alkyl chlorides; it is typically used for the halogenation of alkanes or alkenes. Na₂Cr₂O₇ : A strong oxidizing agent that would oxidize the given secondary alcohol to