Match List-I with List-II.
List-I (Name of reaction)                  List-II (Reagent used)
A. Hell-Volhard Zelinsky reaction       I. NaOH + I$$_2$$
B. Iodoform reaction                            II. (i) CrO$$_2$$Cl$$_2$$, CS$$_2$$ (ii) H$$_2$$O
C. Etard reaction                                   III. (i) Br$$_2$$/red phosphorus (ii) H$$_2$$O
D. Gatterman-Koch reaction               IV. CO, HCl, anhyd. AlCl$$_3$$

Matching each named reaction with its reagent:

A. Hell-Volhard-Zelinsky (HVZ) reaction: This reaction involves α-halogenation of carboxylic acids using Br₂ in the presence of red phosphorus, followed by hydrolysis. Reagent: (i) Br₂/red phosphorus (ii) H₂O → Match with III

B. Iodoform reaction: This reaction is used to detect methyl ketones and secondary alcohols using NaOH and I₂ (or NaOI). Reagent: NaOH + I₂ → Match with I

C. Etard reaction: This reaction converts a methyl group attached to an aromatic ring to an aldehyde using chromyl chloride in CS₂. Reagent: (i) CrO₂Cl₂, CS₂ (ii) H₂O → Match with II

D. Gattermann-Koch reaction: This reaction introduces an aldehyde group on an aromatic ring using CO and HCl in the presence of anhydrous AlCl₃. Reagent: CO, HCl, anhyd. AlCl₃ → Match with IV

The correct matching is: A → III, B → I, C → II, D → IV.