Match List I with List II List I List II (A) Tollens' reagent (I) Roc…

The correct answer is Option (1) → A-III, B-IV, C-II, D-I

These four reagents are named after the chemists who introduced them, and each is identified by what it contains and what it is used for.

• (A) Tollens’ reagent — This matches (III) Ammoniacal silver nitrate. It contains \( \ce{[Ag(NH3)2]+} \); an aldehyde reduces it to a silver mirror.

      \( \displaystyle \ce{RCHO + 2[Ag(NH3)2]+ + 3OH^- -> RCOO^- + 2Ag v + 2H2O + 4NH3} \)

• (B) Jones reagent — This matches (IV) Chromium trioxide in sulphuric acid. \( \ce{CrO3} \) in aqueous sulphuric acid is a strong oxidant that oxidises primary alcohols to carboxylic acids and secondary alcohols to ketones.

      \( \displaystyle \ce{R2CHOH} \xrightarrow{\ce{CrO3}/\ce{H2SO4}} \ce{R2C=O} \)

• (C) Lucas reagent — This matches (II) conc HCl and ZnCl₂. It distinguishes 1°, 2° and 3° alcohols: a tertiary alcohol turns the solution turbid at once, because the alkyl chloride is formed and separates.

      \( \displaystyle \ce{R3C-OH + HCl} \xrightarrow{\ce{ZnCl2}} \ce{R3C-Cl + H2O} \)

• (D) Fehling solution — This matches (I) Rochelle salt. Fehling solution is made by mixing Fehling A (aqueous copper sulphate) with Fehling B (alkaline sodium potassium tartrate, Rochelle salt); aliphatic aldehydes reduce it to a red-brown precipitate of \( \ce{Cu2O} \).

      \( \displaystyle \ce{RCHO + 2Cu^2+ + 5OH^- -> RCOO^- + Cu2O v + 3H2O} \)

Shortcut: (A)–(III) appears in Options (1) and (4), and (B)–(IV) then leaves only Option (1).

Note: The same/similar question has been asked in different years by NTA as per the details given below: