The reagent ‘R’ in the given sequence of chemical reaction is :

F3 Savita Others 16-8-22 D61

  1. CuCN/KCN
  2. H2O
  3. CH3CH2OH
  4. HI

Answer (Detailed Solution Below)

Option 3 : CH3CH2OH
Free
CT 1: Botany (Cell:The Unit of Life)
30 K Users
25 Questions 100 Marks 20 Mins

Detailed Solution

Download Solution PDF

Concept:

Reduction of diazonium salt to Arene -

  • The reduction of diazonium salt gives some arene in presence of some mild reagent.
  • These reagents can be -
    1. Hypophosphorous acid
    2. Ethanol
  • The most common use reagent in the reaction is ethanol.

Explanation:

The given reaction is a two-step reaction-

  1. ​Diazotization of tribromoaniline -
    • ​​Diazotization of 2,4,6-tribromoaniline is done with the help of NaNO2 in presence of HCl.
    • Diazonium salt of given arene is obtained as a result of the first step.
  2. Reduction of the obtained diazonium salt -
    • It is generally done with the help of ethyl alcohol.
    • The corresponding arene is obtained as a product of the second step.

The overall reaction is -

F3 Savita Others 16-8-22 D62

∴ Reagent R should be C2H5OH with a diazonium salt.

Hence, the correct answer is option 3.

Latest NEET Updates

Last updated on Jun 3, 2025

->NEET provisional answer key 2025 was made available on June 3, 2025 on the official website for the students to check.

->NEET 2025 exam is over on May 4, 2025.

-> The NEET 2025 Question Papers PDF are now available.

-> NTA has changed the NEET UG Exam Pattern of the NEET UG 2025. Now, there will be no Section B in the examination.

-> Candidates preparing for the NEET Exam, can opt for the latest NEET Mock Test 2025

-> NEET aspirants can check the NEET Previous Year Papers for their efficient preparation. and Check NEET Cut Off here.

Get Free Access Now
Hot Links: teen patti glory teen patti sweet dhani teen patti