NEETChemistryp Block Elements (Group 15, 16, 17 & 18)
Match List-I with . 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 Choose the correct answer from the options given below:
Options
- AA → III ; B → I ; C → II ; D → IV
- BA → I ; B → II ; C → III ; D → IV
- CA → III ; B → II ; C → I ; D → IV
- DA → III ; B → I ; C → IV ; D → II
Correct answer
A. A → III ; B → I ; C → II ; D → IV
Step-by-step solution
(A) Hell-Volhard-Zelinsky reaction: Carboxylic acid react with chlorine or bromine in the presence of phosphorus to give α - halogenated carboxylic acids. The halogenation continues till all the hydrogen atom in the α - position are replaced by halogen atoms. This reaction is called HVZ (Hell-Volhard-Zelinsky) reaction. CH 3 COOH Acetic acid → - HCl Cl 2 , P 4 ClCH 2 COOH Chloroacetic acid → - HCl Cl 2 , P 4 Cl 2 CHCOOH Dichloroacetic acid → - HCl Cl 2 , P 4 Cl 3 CCOOH Trichloroacetic acid (B) Iodoform reaction: Th