COMEDK 2025 Morning Solved Paper

Concept:This question involves the hydrolysis of benzene diazonium chloride to phenol, followed by Williamson ether synthesis to form an allyl phenyl ether.Explanation:Step 1: Benzene diazonium chloride ($\mathrm{C_6H_5N_2^+Cl^-}$) when warmed with water undergoes hydrolysis.The reaction produces phenol ($\mathrm{C_6H_5OH}$), nitrogen gas, and hydrochloric acid.$$\mathrm{C_6H_5N_2^+Cl^- + H_2O \xrightarrow{\Delta} C_6H_5OH + N_2 + HCl}$$Step 2: Phenol is treated with sodium hydroxide to form its sodium salt, sodium phenoxide ($\mathrm{C_6H_5ONa}$).$$\mathrm{C_6H_5OH + NaOH \longrightarrow C_6H_5ONa + H_2O}$$Step 3: Sodium phenoxide reacts with allyl bromide ($\mathrm{BrCH_2CH=CH_2}$) via Williamson ether synthesis.This nucleophilic substitution yields phenyl allyl ether and sodium bromide.$$\mathrm{C_6H_5ONa + BrCH_2CH=CH_2 \longrightarrow C_6H_5OCH_2CH=CH_2 + NaBr}$$Thus, compound $[\mathrm{X}]$ is phenyl allyl ether, with the structure $\mathrm{C_6H_5-O-CH_2-CH=CH_2}$.Answer:Option B: $\mathrm{C_6H_5-O-CH_2-CH=CH_2}$